No harness is escape-proof, and this page shows how to make this one hard to back out of

“My last dog was a Houdini and slithered out of many harnesses.” An owner wrote that on a dog forum, and plenty of Frenchie owners could sign it. You may be here because your dog has backed out of one already.

The honest answer to “is there a harness he can’t escape from?” is no. Any harness comes off a dog when it hangs loose, and the words escape-proof in a product name do not change that.

Here is what this harness gives you instead. It is padded and printed in camo, and it is cut for a French Bulldog with a chest of 44 to 66 cm (17.3 to 26.0 in).

A foam panel lies across his back. A closed neck loop, two buckles and sliding straps hold it on, and the leash clips to one ring on his back.

You set the fit, and the fit does the work. The rest of this page is how to check it.

Slack is how a dog gets out, so taking it out is the whole job

Picture another dog across the street. Your Frenchie plants his front feet, drops his head and backs up. If the straps hang loose, the harness rides forward over his shoulders and he steps out of it.

Reviewers who test escape-proof harnesses say a thick back panel and a snug fit make a slip less likely. They also say no short harness is fully escape-proof, and this is a short one. Here is the test that shows whether yours is snug.

First, close both buckles. Take up the straps until two flat fingers fit under each side strap. Three fingers means loose, and one finger means too tight.

Then walk him ten steps indoors and stop. Clip the leash to the ring on his back and lean back on it, gently. Watch the panel. It should stay between his shoulder blades. If it slides toward his neck, or a strap climbs, tighten and test again.

Check the neck loop the same way. A loop that hangs loose can ride up toward his ears when he backs up, so two flat fingers should fit between the loop and his neck.

Straps can loosen with use, so run the same test on the tenth walk. If he still gets out at your front door, do not walk him near traffic in it. Use the 30-day happiness guarantee and send it back.

Where the straps sit decides whether he ends up with a sore patch

“Always causes chafing/redness under my pup’s armpits.” One owner wrote that about a different harness, and a lot of owners would sign it.

Here is where a strap should not sit. Lift a front leg and look at the hollow where the leg meets his body. You should see fur there, not strap, because the strap belongs behind that hollow, on his ribs.

A harness that is too big shifts with every step, and a harness that shifts rubs. Compare his left side with his right after each adjustment, since a harness set longer on one side turns toward the shorter side.

Then sit him down and look again. The buckles and strap ends should not dig into his side when he sits or lies down. If one does, adjust it before the next walk.

Do the check after a walk, when he has warmed up and the straps have settled. Here is when to look and what to look for.

If you see redness, stop using the harness and ask your vet.

It goes on over his head, and a Frenchie who hates that has two better options

“Doesn’t go over the head (which my guy hates).” An owner wrote that in praise of a different harness. This one is not that harness.

The neck loop is closed and has no buckle, so it goes over his head first. Then a buckle on each side shuts the straps around his belly. For a dog who stands still, that takes a few seconds.

A dog who ducks the moment it comes near his ears needs a slower start. On day one, leave the harness on the floor beside his dinner bowl.

On day two, hold the neck opening wide and let him put his own head through for a treat. On day three, fasten it loosely for a few seconds, then take it off and praise him.

Puppies freeze too. One owner of a four-month-old wrote that she was “just stubbornly sitting and wouldn’t move” the first times. Try it indoors, on the floor he already likes.

If he still ducks, do not force it. Our Step-In Harness has him put his front legs through two openings, with one buckle on his back. Our Leopard Escape Harness opens flat, and two buckles close it. Nothing touches his head on either one.

A 25 lb Frenchie takes S or M, and the chest tape decides which

A 25 lb Frenchie is 11.3 kg, which sits in the weight range of M. If his chest tapes under 53.5 cm, he takes S. The chest decides, and weight only checks it. If the puppy is still at the breeder’s, ask for his chest measurement on the day you collect him, and note his weight beside it.

The second column lists the chest each size is cut to hold. It is the dog’s chest you look up, not a harness lying flat on the floor. A Frenchie carries a broad chest, so weight alone can mislead. The weight column is the check: it should point to the same row as the tape, and if it does not, go with the tape.

If you have a tape, wrap it just behind his front legs. Keep it flat and snug, with no slack and no squeeze. Write the number down and look it up as it is. Nothing gets added.

Two fingers come later, once the harness is buckled on him: two flat fingers should slide under each strap.

No soft tape? Use a piece of string. Wrap it behind his front legs, mark where it meets itself, and hold it against a ruler.

Say the tape reads 46 cm. Only S reaches that, so it is S. Say it reads 57 cm. Only M reaches that, so it is M.

Say a 25 lb Frenchie tapes 51 cm. His weight points to M, but only S reaches 51 cm, so it is S.

The overlap is where it gets tight. S runs up to 55 cm and M starts at 52, so from 52 to 55 cm both sizes hold him. Take the one where his number sits farther from the edge of its range. At 52 cm that is S, with 3 cm to spare, while M has none. At 53 cm it is still S, 2 cm against 1.

At 53.5 cm the two are level, 1.5 cm from the edge each. A tie goes to M, because a harness can be taken in but not let out. From 54 cm up it is M.

If a number fell in a gap between two rows, the larger size would be the right one. The chest range has no gap between 44 and 66 cm, so only the overlap rule applies. The weight column does have one, the half kilo between 9 and 9.5 kg, and a dog in it goes by the tape and the two-finger test.

The smallest setting on S is 44 cm. A puppy who tapes under 44 cm cannot get this harness snug, so he is a Puppy Harness dog for now. A growing dog also changes the fit, so repeat the two-finger check whenever the panel starts to slide.

For scale, the AKC breed standard sets 28 lb (12.7 kg) as the show limit for a Frenchie, and M reaches 17.5 kg (38.6 lb). A chest over 66 cm (26.0 in) is outside M. Under 44 cm (17.3 in) he is below S, and our Puppy Harness starts at a 32 cm chest.

The camo is a patch on a black harness, and every part is in this table

Look at the photos again. The print sits on the panel across his back, and the straps, the handle, the buckles and the lining are black. If you want a harness that is camo from end to end, this is not it.

Blue camo is light blue with olive and black blotches. Green camo is olive-brown with tan and dark green marks. White camo is white, dark green and black. Rose camo is pink with grey and black.

The other two finishes are leopard print and plain black. All six take S and M, and all six use the same chart.

The photos on this page show three of them worn: blue camo on a fawn Frenchie, green camo on a black one and white camo on a cream one.

The strip in the straps is reflective, so a car’s headlights will pick it out on a dark evening walk. The harness comes on its own, so the leash is yours to choose.

One ring on his back turns nothing, so a leaner belongs in a different harness

The ring sits on his back, at the base of the handle. Here is what that means on a walk. When he lunges, the pull goes straight forward, and nothing turns his front end back toward you.

On a slack leash that does not matter, because the leash simply hangs from his back. If he leans into the leash at every corner, look at our Front-Clip Harness, which has a second ring on the chest panel. A chest ring turns him, but it does not teach him to stop.

The handle stands up over his back. Use it to steady him at a kerb or a door. Do not lift him by it, because it is a grab handle and not a carry strap.

Here are three of our harnesses side by side.

Pick this one if you want a padded panel across his back, a handle and a camo print. Pick the Front-Clip Harness if he leans and you want a leash in the box. Pick the Leopard Escape Harness or the Step-In Harness if he will not accept anything near his head.

This harness is the wrong choice for a dog with a chest over 66 cm (26.0 in) or under 44 cm (17.3 in).