Trunk Math: The Factor That Decides This for Most People
Here is the comparison nobody runs, and it is usually the one that settles the question before certification ever gets a vote.
A harness occupies a seat belt position. That’s its entire footprint in your vehicle. Sleepypod describes the Clickit Range’s “3 Point Design” as one that “Connects to any vehicle seatbelt without restricting driver motion”, and specifies a “Three-point design for use in the rear passenger seat.” So the space it costs you is one rear belt position. Sleepypod publishes no stowed dimensions for the harness, because there’s nothing meaningful to stow. It rides on the dog.
A crate occupies volume you have to go find. These are the numbers to hold a tape measure against:
- Gunner G1 Intermediate: 48 pounds empty, 34 by 23 by 28.5 inches, or 30 inches tall measured with the carry handles. That’s the certified size most owners of a mid-size or large dog land on, so it’s the one to measure first, and the taller figure is the one your hatch has to clear.
- Across the rest of the G1 line, Gunner lists 27 pounds at Small, 38 at Medium, and 72 at Large, with exteriors running from 24.5 by 18.625 by 19 inches up to 40.25 by 28 by 33.25 inches. Gunner publishes a handles-included height for every size too: 20.5, 25, 30, and 34.5 inches from Small up to Large.
- Petmate Sky Kennel 36-inch: 20.75 pounds empty, 36 by 25 by 27 inches, sized for a 50 to 70 pound dog.
Those have to fit into a cargo area that’s also holding water, food, medications, a first aid kit, and whatever the humans in your household are bringing.
Three practical rules come out of this:
- Measure the trunk opening, not just the floor. A crate that fits the cargo floor but won’t clear the hatch aperture is a crate you can’t load. Check the diagonal of the opening against the crate’s largest exterior face, and use the height that includes the carry handles rather than the shell height, because the handles are part of the object you have to push through.
- Add the dog’s weight to the crate’s. A 48-pound Gunner Intermediate with a 60-pound dog inside is a lift over 100 pounds, at chest height, in a hurry, possibly alone. Make that discovery in your driveway on a calm afternoon, not on evacuation morning.
- Count the people first. An evacuation vehicle carries humans, and humans occupy the seats a harness would use. If every seat is taken and the cargo area is full, you may have no room for either, which is the point at which the real answer is a second vehicle or a smaller crate for a smaller animal.
If your household is already at the edge of vehicle capacity, our how many pets fit in a car guide works through the volume and seating math directly, and our vehicle loading and restraints for multiple pets guide covers loading order and anchoring once you’ve chosen.
Loading Speed Under Time Pressure
Evacuation orders don’t arrive with a comfortable lead time, so the restraint you can deploy fastest carries a real safety value no spec sheet shows. Count the steps and the weight, since both are already on this page.
A fitted harness is two steps on the day: put it on the dog, thread the vehicle belt. Both are short, both are repeatable, and you can do them in the dark. Sleepypod adds quick-connection and release mechanisms to the Clickit Range and says the design accommodates “narrow, deep, or barrel chests.” Those two steps only exist if the sizing and adjustment already happened, though. A harness opened for the first time on evacuation morning turns into an adjustment session with a stressed dog, and a harness fitted wrong is not the product CPS tested.
A crate is four steps, and the heaviest one is first: lift it in, position it, strap it down, then load the dog. For a Gunner Intermediate that opening lift is 48 pounds empty, and if you ever move it with the dog inside, the trunk math above puts the combined load past 100 pounds. The strapping step isn’t optional either, because Gunner’s own tie-down straps are part of the certified configuration. What you gain is the last step: loading the dog is one motion through an open door, and a dog that already sleeps in that crate at home will often load itself.
The honest read: the crate is faster if it lives in the vehicle already anchored, and much slower if it lives in the garage. The harness is faster in nearly every scenario, provided you fitted it in advance. Both fail badly when the first time you handle them is the day you need them. That’s why the closing instruction on this page is a dry run rather than a purchase.
Which One Still Does a Job After You Park
You park at two in the morning at a fairground three hundred miles from home, and now the dog has to be somewhere while you sleep. That’s the point where the two categories stop being comparable at all.
The drive is not the emergency. The drive is the first hour or two of a situation that may run for days. ASPCA’s disaster preparedness guidance lists “A traveling bag, crate or sturdy carrier, ideally one for each pet” in the evacuation kit, and it warns that “Pets can become disoriented and wander away from home in a crisis.” ASPCA also states, “Note that not all shelters accept pets, so it is imperative that you have determined where you will bring your pets ahead of time.”
Put those together and the destination problem appears. Wherever you end up, one of these is likely true:
- A hotel room with a door that opens directly onto a parking lot, and a dog that has never been there before.
- A shelter or fairground where animals are held in a designated area and staff need to move them without you.
- A friend’s house with its own animals, its own doors, and no fence you’ve checked.
In every one of those, a crate is doing work and a harness is not. A harness restrains a dog only while a person is holding the other end. A crate holds a dog while you sleep, while you go find food, while you fill out paperwork. Gunner’s G1 closes with a paddle-latch that “includes a key-in-the-hole lock” plus “Top & bottom locks added for extra backup”, which reads like overkill until you picture a row of kennels at a fairground with strangers walking past all day.
The Petmate Sky Kennel makes the same point from the budget end. It ships with “2 ‘LIVE ANIMAL’ stickers, a food and water cup, ID stickers, and absorbent material,” which are all destination-side items. That kennel exists to be handed to somebody, which is exactly the half of the job a crate owns outright.
Once a crate is set down in a row of other crates, it also stops being obviously yours. Our crate and kennel emergency ID card checklist covers the fields that actually get an animal back to you and how to attach a card so it survives the trip. And if you don’t yet know whether your local shelters take animals at all, start with do pet-friendly disaster shelters exist, because the answer changes the whole calculation.
Multi-Pet Reality: Where the Math Inverts
Everything above assumes one animal. Add a second and a third and the comparison changes shape.
Crates don’t stack in a car the way people assume. Each one takes its own footprint and its own anchoring. Three Gunner Intermediates at 34 by 23 by 28.5 inches each is not a configuration that fits in a mid-size SUV alongside people and supplies, and three of them at 48 pounds empty is 144 pounds of crate before any dog gets in. Cost multiplies too, which is why the honest multi-pet plan often mixes tiers rather than buying the certified pick three times.
Harnesses do stack, after one geometry check. Sleepypod specifies the Clickit Range as a three-point design for use in the rear passenger seat, so what you’re counting is rear positions carrying both a lap belt and a shoulder belt. A lap-only center belt, still fitted in plenty of vehicles, doesn’t reproduce the configuration CPS tested, and no dog belongs in a front seat with a live airbag regardless of what it’s wearing. Count the usable rear three-point positions in your own car rather than assuming three across. Where they exist, each dog gets one, nothing has to be lifted, and nothing competes for cargo volume with the water and food. For a one-person household evacuating three medium dogs, harnesses may be the only physically achievable option.
The destination is the counterweight again, and it’s the multiplication that catches people out. ASPCA asks for a crate or sturdy carrier “ideally one for each pet”, so three dogs means three containers waiting at the far end whether or not three fit in the car on the way. The realistic multi-pet answer is a split: certified or well-fitted harnesses for the drive, and lighter, cheaper containment for the wait, packed collapsed or stacked wherever it fits.
For cats specifically the math runs differently again, because a cat should not be loose in a car at all and a carrier is the only sane option. Our vehicle loading and restraints for multiple pets guide covers mixed-species loads and the order to put them in.
How Each One Fails, and What Makes It Dangerous
Neither product is safe by existing. Each has a specific failure mode, and both failures are common.
The harness fails on fit and on anchoring
A harness that is loose is not the item CPS tested. Crash performance depends on the harness staying against the body and distributing load across the chest, and a harness sized by a weight guess instead of a chest measurement won’t do that. Sleepypod sells the Clickit Range in five sizes across Regular and Long options specifically because chest shape varies, and it says the design accommodates “narrow, deep, or barrel chests.” Buying the wrong one cancels the engineering.
The second failure is the anchor. AVMA’s guidance is to “Look for crash-tested harnesses that work with your vehicle’s seat belt and keep your dog sitting upright versus lying down.” That means the vehicle’s own seat belt, through the harness’s own dedicated connection. Clipping a walking leash from a D-ring to the belt isn’t that. Every inch between the harness and the belt is an inch the dog travels forward before anything catches it, which is why Kurgo’s tether is 10 inches rather than a leash length and why keeping the connection short is a safety choice rather than a style preference.
There is a third condition on the anchor that gear reviews skip: which belt. Sleepypod specifies a “Three-point design for use in the rear passenger seat”, so the tested configuration is a rear position with both a lap belt and a shoulder belt. A harnessed dog belongs in a rear seat, never in a front passenger seat with a live airbag.
The crate fails when nothing holds it down
A crate’s failure mode is uglier, because an unsecured crate doesn’t just fail to protect the dog. It becomes a heavy object moving through the cabin. AVMA’s rule is explicit: “Position the crate/carrier as near to the center of the vehicle as possible, and secure it in place to prevent movement.” Gunner’s certification carries the same condition from the other direction, naming its own straps as the only ones it recommends for the 5-star certified configuration.
So a certified crate sitting loose in a cargo area is not a certified crash system. It is a strong box with nothing attaching it to the car. The badge on the box describes the crate plus its anchoring, and buying only the first half is the single most common way people spend premium money and get an uncertified setup.
The third crate failure is sizing in the wrong direction. AVMA says to choose one “big enough to allow your pet to stand up, turn around, and lie down comfortably.” That is a comfort minimum rather than a crash instruction, and a crate far larger than the animal gives the dog room to be thrown around inside it. Size to the animal, and let the space you happen to have be the second consideration.
For the deeper material question underneath the crate side of this, hard shell versus folding wire and where each one wins, see our wire crate vs. plastic crate for evacuation comparison.
Spec Comparison: Harness Side vs. Crate Side
|
Sleepypod Clickit Range |
Gunner G1 (S/M/Int) |
Petmate Sky Kennel 36“ |
Kurgo Tru-Fit |
| Independent CPS certification |
Yes, 5 Star, Nov 2022 |
Yes, 5 Star, June 2015 |
No, not on the directory |
No, not on the directory |
| Who ran the crash test |
Center for Pet Safety |
Center for Pet Safety |
No published crash test |
Kurgo, at Calspan |
| Tested weight |
110 lb test dog |
75 lb test dog (Intermediate) |
Not crash tested |
25, 50, and 75 lb dogs |
| Cargo volume cost |
A rear seat belt position |
34 x 23 x 28.5 in at Intermediate, 30 in tall with handles |
36 x 25 x 27 in |
A rear seat belt position |
| Empty weight |
Not published as a figure |
27 / 38 / 48 lb by size |
20.75 lb at 36 in (6.27 to 51.5 lb by size) |
Not published as a figure |
| Anchoring requirement |
Threads a rear lap-and-shoulder belt |
Gunner’s own straps, sold separately |
No certified anchoring configuration |
10-inch tether to the belt |
| Contains the pet after you park |
No |
Yes, locking latch with backups |
Yes |
No |
| Size range |
S to XL on CPS’s record; 2XL sold but not CPS-listed |
Small, Medium, Intermediate certified |
21“ to 48“, up to 125 lb dogs |
Tested to 75 lb |
| Price band |
Premium |
Premium |
Mid |
Budget |
Every figure here is cited per row in the product spec tables above, and each of those rows names the exact manufacturer or CPS page it came from.
Decision Framework by What You’re Solving For
| Your situation |
Take this |
Why |
| Car is already full of people and supplies |
Certified harness |
Costs a rear belt position rather than cargo volume |
| You have cargo room and are ending at a shelter or hotel |
Certified crate |
Crash restraint on the drive plus a lockable pen at the destination |
| One person evacuating three dogs |
Harnesses for the drive |
Crates do not stack; rear three-point belt positions do |
| Dog over 110 lbs |
Nothing on the certified list has been tested at that weight |
No published crash record covers a dog over 110 lbs. CPS tested Cabela’s GunDog Large with a 90 lb test dog (May 2024) and Lucky Duck Lucky Kennel Large with a 110 lb test dog (July 2022); Gunner’s Large is not certified at all, and Sleepypod rates the Clickit Range to 110 lbs. Buy on interior dimensions and anchoring, and treat the certification as untested at your dog’s weight |
| A collision is your single top fear |
Either certified model, anchored exactly as its maker specifies |
Compare the two specific records, not the categories. The Gunner G1 Intermediate passed at 5 Star with a 75 lb test dog (June 2015, V15572) only with its own strength-rated anchor straps; the Clickit Range passed at 5 Star with a 110 lb test dog (November 2022, V241364F). Neither result predicts the other’s, and an unstrapped crate has no result at all |
| Budget will not stretch to certified |
Kurgo Tru-Fit plus a non-certified crate |
Self-tested restraint plus real containment beats a loose dog and no pen |
| The crate would live in the garage, not the car |
Harness |
An unanchored crate you have to fetch and strap is the slowest option on evacuation morning |
| Flying is a branch of the plan |
Crate, and confirm with the carrier |
IATA compliance is a separate standard; see airline carrier vs. car crate for evacuation |
What Neither One Can Do
A restraint holds an animal in place. It doesn’t monitor one, and it doesn’t cool a car. Two situations on this page make that concrete: a dog shut inside a strapped-down crate in a vehicle that has stopped moving, and a harnessed dog waiting in a staging area while you carry bins back and forth.
If your pet shows heavy panting, drooling, disorientation, vomiting, collapse, or a change in gum color during loading, the drive, or any heat exposure, that is a call for a veterinarian, not a gear decision.
AVMA’s rule holds whichever product you bought: “Never leave your pet alone in a parked vehicle, no matter what the outdoor temperature or how long you think you’ll be gone.” A certified crate buys you nothing against that, and neither does a certified harness.
- ASPCA Animal Poison Control Center: (888) 426-4435, available 24 hours a day, 365 days a year. A consultation fee may apply.
- Pet Poison Helpline: (855) 764-7661, available 24/7, with a per-incident fee.
For a pet showing active severe symptoms, go directly to the nearest emergency vet and call on the way.
If you landed on the harness, the full certification record behind that side, the three certified models and why most other “crash tested” claims are the maker’s own commissioned work, is on our crash-tested dog harness for a bug-out drive page. If you landed on the crate, our Gunner vs. Ruffland kennel comparison puts the two premium hard shells against each other, including what happened when this category was actually tested. Underneath any crate purchase sits a material question, hard shell against folding wire, and wire crate vs. plastic crate for evacuation settles that one. Readers whose evacuation includes a flight should go to airline carrier vs. car crate for evacuation next, because IATA compliance and crash certification answer different questions. And for the short walk from the car to the shelter door, where a scared dog twists free of whatever it is wearing, see escape-proof harness for a panicked evacuation.
Load the car this weekend, before anything is on fire. Put the people in their seats and the water bins in the cargo area first, because a full car is the condition this whole comparison turns on, then bring out the restraint you own and find out whether it still has somewhere to go. A harness needs a rear belt position that’s genuinely free and a chest measurement you’ve actually taken. A crate needs to clear the opening with the load already in and strap down toward the center once it is through. A restraint that fits an empty car on a calm afternoon has told you almost nothing about the car you would leave in.