Updated 2026 • Pet Carrier Sizing Guide
We take our small dog Django just about everywhere we go. Over the years, he has traveled throughout the U.S. and Europe, explored cities with us, joined road trips and weekend getaways, and logged more flights, train rides, and hotel stays than we could ever count.
All that travel has made one thing very clear: the right pet carrier can make bringing your dog along so much easier—but only if it fits your dog comfortably and works well for you, too.
So how do you find the right pet carrier for your pup?
Figuring out the type of carrier you need is the first task. A tote, backpack, airline-friendly carrier, sling, and travel crate all serve different purposes. If you're still deciding, start with our guide to the different types of dog carriers.
Once you know which carrier style makes sense for your needs, the next question is: Will this specific carrier fit my dog comfortably? And if multiple sizes are offered, what size does my dog actually need?
In this DJANGO article, we cover how to measure your dog correctly for a pet carrier. Weight matters, but it is only one part of carrier sizing. Back length, standing height, body width, chest girth, body shape, and even how your dog naturally likes to sit or lie down will all affect fit.
What Measurements Do You Need for a Dog Carrier?
Measure from the base of the neck to the base of the tail. This is especially important for dog carrier totes, horizontal backpack carriers, and long-bodied dogs.
Measure from the floor to the top of your dog's head while they are standing naturally. If your dog has upright ears, measure to the tips of the ears too. Standing height is especially important for fully enclosed carriers.
Measure straight across the widest part of the shoulders or rib cage. This helps you judge how much usable interior width your dog actually needs.
Measure around the widest part of the rib cage, usually just behind the front legs. This helps describe overall body size and shape.
Check the carrier manufacturer's weight limit, but remember that it is not a guarantee of fit. Also consider how much weight you will personally be carrying once your dog is inside.
Does your dog sit upright, curl into a ball, stretch out, or prefer standing on all fours? How they naturally settle matters too.
Before you measure
1. Back length
2. Standing height
3. Body width
4. Chest girth
5. Weight
How to read carrier dimensions
Measure for a dog carrier tote
Dachshunds & long-bodied dogs
Measure for a backpack carrier
Measure for an airline pet carrier
Common sizing mistakes
Before You Measure Your Dog
You don't need any special equipment. A soft measuring tape is easiest, although a piece of string and a ruler will also work well.
Measure your dog while they are standing on all fours on a level surface, with their head in a relaxed, natural position. You want the dimensions that best reflect how their body will actually fit inside a pet carrier.
Dogs wiggle. Dachshunds wander off halfway through. Puppies decide the measuring tape is a toy. If two measurements are slightly different, use the larger number when evaluating carrier fit.
How to Measure Your Dog's Back Length
Measure from the base of your dog's neck to the base of the tail.
Start where your dog's neck meets the shoulders and run the measuring tape along the top of the back. Finish where the tail joins the body—not at the tip of the tail.
We've learned not to underestimate this measurement with Django. A compact 12-pound pug and a long 12-pound dachshund may weigh exactly the same while needing very different amounts of usable floor space.
How to Measure Your Dog's Overall Standing Height
Have your dog stand naturally and measure from the floor to the top of the head. If your dog has upright ears, take a second measurement to the tips of the ears and note the larger number.
Standing height is particularly important when the dog will ride inside a fully enclosed carrier. A dog can fit comfortably on the floor of a bag and still be too tall once the top is zipped closed.
Some carrier companies ask for shoulder height, also called height at the withers. Measure this from the floor to the top of the shoulder blades and use it only when the manufacturer's instructions call for it. Shoulder height does not replace overall standing height when your dog's head and ears must fit inside a fully enclosed carrier.
For a scoop-style dog carrier tote, overall height is usually less restrictive because the design is intended to let your dog's head extend through the opening. Height and proportions still matter, though: the sides and scoop should sit comfortably around your dog's body, chest, and neck when they are in their natural riding position.
How to Measure Your Dog's Body Width
With your dog standing naturally, measure straight across the widest part of the shoulders or rib cage from side to side. Do not wrap the tape around the body—that is chest girth, which is a different measurement. If a flexible tape is difficult to use, place two straight objects gently alongside your dog and measure the distance between them.
This measurement is easy to overlook, but it can be very useful when comparing your dog with the interior width of a carrier.
A French Bulldog, for example, can have a much broader, more compact body than a dachshund of similar weight. The number on the scale may be almost identical, but the space each dog needs inside the carrier can be very different.
How to Measure Your Dog's Chest Girth
Wrap a soft measuring tape around the widest part of your dog's rib cage, usually just behind the front legs. Keep the tape comfortably snug without pulling it tight.
Chest girth is useful for understanding your dog's overall body size and shape, and some carrier manufacturers incorporate girth into their sizing recommendations.
There is one important distinction, though: chest girth is a circumference measurement. You cannot directly compare a 20-inch chest girth with a carrier that is 10 inches wide.
For that reason, we consider girth helpful supporting information, while your dog's actual body width is often more useful when evaluating the interior width of a carrier.
Weigh Your Dog
This one is easy, fortunately!
If your dog will not stand on the scale, weigh yourself while holding them and subtract your own weight.
Check your dog's current weight against the carrier manufacturer's limit. The base, seams, handles or straps, tether attachment, and hardware all need to be appropriate for the dog riding inside.
Treat a carrier's maximum weight as an upper limit—not a promise that every dog below that number will fit. A long, tall, or broad dog can be too large for a carrier even when they are well below its stated weight limit.
Weight also matters for your comfort.
A 7-pound dog in a tote and a 20-pound dog in the same style of carrier are very different carrying experiences. For heavier small dogs or longer outings, a supportive dog carrier backpack that distributes weight across both shoulders may be more comfortable than a one-shoulder tote.
Check the airline's current pet policy before booking. Airlines set their own limits for carrier dimensions, pet size, and in some cases weight. The U.S. Department of Transportation notes that airline pet restrictions vary, including size and weight requirements. Review the DOT's current pet travel guidance.
Comparing Dog Measurements with Carrier Dimensions
Once you have your dog's measurements, you need to compare them with the pet carrier you're considering.
First, determine whether the published carrier dimensions are exterior dimensions or usable interior dimensions.
Exterior dimensions tell you how large the bag is from the outside. That matters enormously for airline travel because the complete carrier has to fit within the airline's current under-seat requirements.
But exterior measurements do not always tell you exactly how much room your dog has inside.
Padding, reinforced walls, curved sides, internal frames, padded beds, pockets, and other construction details can reduce usable interior space.
Airline and under-seat restrictions, storage, fitting the carrier in your vehicle, and understanding the overall size of the bag.
Your dog's actual comfort, floor space, standing room, turning room, body width, and preferred riding position.
When possible, look beyond a simple “dogs up to 20 lbs” claim and compare your dog's actual measurements with the manufacturer's detailed sizing guidance.
Also confirm the order of the listed measurements rather than assuming every brand uses length × width × height. If a company only publishes exterior dimensions, ask for the usable floor and interior dimensions before deciding on a size.
How to Measure Your Dog for a Carrier Tote or Dog Purse
For a dog carrier tote or pet purse, we pay closest attention to back length, body width, weight, and the amount of usable floor space.
For a scoop-style dog carrier tote, where the dog's head is intended to extend through an opening:
- Back length from the base of the neck to the base of the tail is usually the most useful length measurement.
- Because your dog's head is intended to extend through the scoop, the carrier does not need to accommodate the dog's full nose-to-tail length inside the bag.
- Overall height still helps you judge where the opening and sides will sit relative to your dog's chest, neck, and shoulders.
For a fully enclosed tote-style pet carrier:
- Sizing is different because your dog's entire body needs to fit inside the closed carrier.
- Consider full body length from the tip of the nose to the base of the tail, along with overall standing height, body width, weight, and the carrier's usable interior dimensions.
- Does my dog's body fit comfortably along the usable floor?
- Is the carrier wide enough for them to sit or curl up without being squeezed?
- Does the base remain firm and level beneath their weight?
- Can they settle naturally in the riding position intended for that carrier?
- Is my dog within the manufacturer's stated weight limit and sizing guidance?
Long-bodied dogs deserve particular attention here. A dachshund may be light enough for a smaller tote according to weight but too long to fit comfortably on its floor.
The opposite can happen too. A compact but broad dog may have plenty of floor length while needing additional width.
If you're measuring specifically for our DjangoTote™ Dog Carrier Tote, compare your dog's measurements with the Medium and Large dimensions on the product page. If the numbers do not give you a clear answer, send us your dog's breed, weight, back length, and height and we will gladly help with fit and ensure you select the right carrier size.
If you are specifically shopping for a scoop-style or partially open pet carrier tote, our guide to dog carrier tote safety and support explains what to look for in the base, tether, construction, airflow, handles, and other load-bearing details.
How to Measure a Dachshund or Long-Bodied Dog for a Pet Carrier
If you have a dachshund, corgi, basset hound, or another long-bodied dog, pay especially close attention to back length and usable floor length. This is one of the clearest examples of why a pet carrier's maximum weight recommendation does not tell you the whole story.
We've seen this firsthand with Django. A long-backed dog can fall comfortably below a carrier's maximum weight and still need more floor length than a shorter, more compact dog who weighs several pounds more.
The same principle matters inside a pet carrier. Your dog's torso and rear end should be supported from underneath rather than dangling outside the carrier or being forced into an awkward position. In a scoop-style tote, the dog's head can extend through the opening while the torso and rear remain supported along the base.
For long-bodied dogs, don't automatically size down simply because your dog is lightweight. Compare their actual back length with the carrier's usable floor, consider how they naturally sit or curl up, and make sure the base provides enough stable support for their body.
We learned to take this support seriously after Django suddenly lost the use of his back legs and needed emergency spinal surgery for IVDD. A carrier cannot prevent or treat a spinal condition, but a structured, supportive floor is one of the first things we look for when evaluating fit for a long-backed dog. You can read more about Django's IVDD experience.
If your dog has current back or neck pain, a recent spinal injury or surgery, or another orthopedic or mobility condition, ask your veterinarian which carrier style and riding position are appropriate.
How to Measure Your Dog for a Backpack Carrier
Some backpacks position dogs upright. Others, including our DjangoPack™ Dog Carrier Backpack, are designed with a horizontal floor so the dog remains fully supported from underneath and can naturally stand on all fours, sit, or lie down.
For a horizontal backpack carrier, compare your dog's back length, standing height, body width, weight, and preferred riding position with the carrier's usable interior—not just its exterior dimensions.
A longer, leaner dog may fit comfortably because their narrow body uses less of the available floor space. A shorter but stockier or broader-chested dog may take up considerably more width and depth. In a rectangular carrier, some dogs also sit or curl diagonally, so back length is important but should not be treated as a universal one-to-one floor-length cutoff.
The human side of fit matters with backpacks too. As your dog's weight and carrying time increase, padded shoulder straps, an adjustable sternum strap, a supportive hip belt, balanced weight distribution, and a comfortable back panel make a noticeable difference.
If you're comparing backpack styles, see our detailed guide to choosing a dog backpack carrier.
Already considering the DjangoPack? Our DjangoPack Dog Carrier Backpack Size & Fit Guide explains how we evaluate weight, back length, height, and body shape together.
How to Measure Your Dog for an Airline Pet Carrier
For an airline pet carrier, focus on these measurements:
- Full body length: Measure from the tip of your dog's nose to the base of the tail. Unlike a scoop-style tote, an airline carrier has to contain your dog's head and body completely when closed.
- Overall standing height: Measure from the floor to the top of your dog's head while they are standing naturally, and note the height to the ear tips if the ears stand upright. This helps you evaluate the vertical room inside the closed carrier.
- Body width: Measure across the widest part of the shoulders or rib cage so you can compare your dog with the carrier's usable interior width.
- Weight: Check the carrier manufacturer's weight limit and any applicable pet or combined pet-and-carrier weight limits imposed by the airline.
Your dog must fit comfortably inside the closed carrier, and the carrier's exterior must fit within the under-seat limits for your airline, aircraft, and seat. A larger carrier may give your dog more room but still be unusable for a particular flight.
Then Check Your Airline's Carrier Limits
There is no universal “airline-approved” pet carrier size. Both American Airlines and Delta list 18" L × 11" W × 11" H as the maximum dimensions for soft-sided in-cabin pet carriers. However, Delta also notes that maximum dimensions depend on the aircraft being flown. Other airlines and aircraft can have smaller limits, so always check your airline's current policy before booking.
Check your airline’s maximum pet carrier dimensions, ventilation requirements, fit requirements, and any applicable pet or combined pet-and-carrier weight limits.
We have flown with Django throughout the U.S. and Europe, and we never assume that what worked on our last flight will automatically work on the next one. We check the airline's current pet policy before booking and again before traveling, especially when an itinerary includes a different aircraft or partner airline.
Our regularly updated U.S. airline pet policy comparison can help you check current carrier restrictions before you fly.
How Much Room Should a Dog Have in an Airline Carrier?
Your dog should fit comfortably inside the fully closed carrier, but exact wording varies by airline. American Airlines says a carry-on pet must fit comfortably inside the closed or zipped carrier. Delta says the pet must be able to move around without touching or sticking out from the sides. Always verify the operating airline's current fit rules before booking and again before traveling.
Common Dog Carrier Sizing Mistakes
Weight is an important upper limit, but it does not tell you whether your dog is long, tall, broad, compact, or narrow. “Up to 20 lbs” is not the same as “fits every dog under 20 lbs.”
For back length, measure from the base of the neck to the base of the tail. For a fully enclosed carrier, you may also need full body length from the tip of the nose to the base of the tail. Neither measurement includes the tail itself.
A carrier may look large from the outside while offering much less flat interior floor space once padding and structure are considered.
Chest girth measures around the body. It cannot be directly compared with a carrier's straight-line interior width.
A dog who curls into a tiny ball uses space very differently from one who prefers sitting upright or stretching out. For airline travel, however, your dog's favorite curled-up position does not override the airline's fit requirements.
Carrier requirements vary. Always verify the operating airline's current pet policy for your specific trip.
What if Your Dog Is Between Pet Carrier Sizes?
For an everyday tote or backpack, the larger size may make more sense if your dog's back length is close to the smaller carrier's usable floor length, they are broad through the chest, or they are still growing—provided the larger carrier still holds them securely and is comfortable for you to carry.
If your dog is petite, narrow, comfortably within all dimensions, and would slide excessively inside the larger carrier, the smaller size may fit better.
For an airline carrier, do not automatically size up. The larger bag must still fit beneath the seat and comply with the operating airline's exterior limits.
Most importantly, use the individual manufacturer's sizing guidance. Carrier dimensions, structure, openings, intended riding positions, and usable interior space vary too much for one universal “add two inches” rule to be reliable.
A good pet carrier company should be able to help evaluate fit using your dog's breed, weight, back length, height, body shape, preferred riding position, and how you plan to use the carrier.
At DJANGO, we know our pet carriers inside and out. We also know how different breeds, body shapes, and weights tend to fit in each design. If you're considering a DJANGO pet carrier but aren't sure which size is right for your pup, we're here to help!
Final Thoughts: Measure the Dog, Not Just the Weight
If you remember one thing from this guide, make it this: two dogs at the exact same weight can need completely different pet carrier sizes.
Measure your dog's body, consider how they naturally like to ride, and compare those measurements with the carrier's actual usable space—not just its maximum weight recommendation.
A well-fitting carrier should comfortably support your dog and make bringing them along easier for both of you. After more than a decade of traveling with Django, that's still the standard we use every time we evaluate a pet carrier.
Find the Right Carrier for Your Dog
Explore DJANGO pet carriers designed around supportive floors, secure construction, thoughtful sizing, premium materials, and real-world travel with small dogs.
Shop DJANGO Pet CarriersHelpful Dog Carrier Sizing & Travel Guides
- 5 Types of Dog Carriers: Which Is Best for Your Dog?
- Are Dog Carrier Tote Bags Safe? What to Look For in a Supportive Pet Carrier
- Best Dog Carrier Tote Bag for Small Dogs: What to Look For
- How to Choose a Dog Backpack Carrier: Size, Safety & Fit
- DjangoPack Dog Carrier Backpack Size & Fit Guide
- U.S. Airline Pet Policy Comparison for In-Cabin Travel
- How to Train Your Dog to Love Riding in a Pet Travel Carrier
