A 25 lb Frenchie weighs 11.3 kg, and the largest size of this vest is meant for dogs up to 7.5 kg

“Sizing recommendations for a typical 25 lb Frenchie?” An owner asked that on r/Frenchbulldogs, and it is the first question this page has to answer.

For this vest the answer is short: not this one. A 25 lb Frenchie weighs 11.3 kg. The XL is meant for dogs of 6 to 7.5 kg, which is 13.2 to 16.5 lb. Pick another harness from the shop for him.

This is a vest for a smaller dog. It suits a puppy who is still under 7.5 kg, and a Frenchie who stays small. You get a light mesh vest in two sizes and a 1.2 m leash in the box.

Three facts before you read on. The vest weighs 80 or 85 g. It reflects light in three spots. It goes on over his head and closes with one buckle at his side.

Mesh, one buckle and one ring: the whole vest weighs 85 grams

The fabric is polyester sandwich mesh. That means two faces of open mesh held apart by thin threads, so there is a gap of air between them.

Weight is 80 g in the L and 85 g in the XL, which is 2.8 and 3.0 oz. The edge around the neck and both leg openings is soft black binding. The straps are flat black webbing.

The hardware is short. One black plastic buckle closes the chest strap on one side of his body, and a slider on the other side sets the length. One metal D-ring hangs from a webbing strap sewn down the middle of the back panel. That ring is the only place to clip the leash.

The leash is in the box with every color. It is flat webbing, 1.2 m (3.9 ft) long and 1.5 cm (0.6 in) wide, in the color of the vest. The metal clip is made to swivel, so the leash does not wind around itself. It is a plain walking leash.

Three reflective spots: the paw shield on his chest and a strip on each shoulder

It is 5 p.m. in November and the light is gone. A car backs out of a driveway, and its headlights sweep across a low dog on the pavement.

The paw shield on his chest is reflective. So is a strip on each shoulder, on the back panel. From the front the driver sees the shield. From the side or from behind the driver sees the strips.

Reflective film sends light back toward where it came from. It helps a driver notice him sooner. It does not make a dark road safe. On a road without a sidewalk, keep him on a short length of leash, close to you.

Six colors are in the shop: black, blue, red, green, orange and coffee brown. Every one carries a paw shield. On black and on coffee, the pale shield is the one light patch on the front of him.

Read the tape before the scale: L is cut for a chest of about 46 cm, XL for about 57 cm

Put a soft tape around him behind his front legs, at the widest part of his chest, and keep it flat and snug. Read the number off the tape and take it to the table as it is. Nothing gets added.

The neck needs a second look. One owner wrote that Frenchies have “thick, muscular necks that are almost the same width as their heads.” On a vest that goes over the head, that matters twice.

The opening must clear the head, and it cannot be tightened. It is fixed at 34 cm on the L and 38 cm on the XL.

So tape the widest part of his head as well. If that number is bigger than the neck opening, the vest will not go on without a fight.

This chart gives one number per size, not a range, so find the number closest to his tape. A 48 cm chest is an L, and a 55 cm chest is an XL.

Exactly halfway, at 51.5 cm, take the XL, because its strap can be pulled in and an L that is too small cannot be let out. Under 46 cm or over 57 cm, this vest is not for him.

Then check the weight column. The two columns do not always agree: a 57 cm chest on a dog of 7.5 kg is a stocky dog. If the tape says XL and the scale says 9 kg, believe the scale and choose another harness.

It goes over his head, and one buckle at his side closes the chest strap

There is no buckle at the neck or on the shoulders. The neck opening is a closed loop of mesh with soft binding, so his head goes through it first. Here is the order.

First, open the buckle and slide the strap loose. Next, lift the neck opening over his head and let the panel rest on his chest. Then bring the strap under his ribs, behind the front legs. Last, click the buckle and pull the slider until two flat fingers fit under the strap.

One owner wrote that a harness “always causes chafing/redness under my pup’s armpits.” Where the strap sits decides that. It belongs across the ribs. It does not belong in the hollow right behind the front leg.

A dog who hates a loop near his ears will hate this vest. One owner picked a harness because it “doesn’t go over the head (which my guy hates).” If that is your dog, look at the Step-In Harness. His front legs step into two openings and nothing passes over his face.

One ring on his back means a pull lands on his back, so this vest is for walking beside you

“The harness tends to pull and twist to the side a lot.” That is how one owner described a harness on a dog who pulls. Here is what that means on this vest.

The only leash ring is the D-ring on his back. When he lunges, the leash pulls that ring backward, and the chest panel pulls against his chest. Nothing turns him toward you. He can lean into it and keep going.

When the vest rides sideways, check the chest strap first. Often the strap is loose. Two flat fingers, no more, and the ring stays in the middle of his back.

A vest with one back ring is not a no-pull harness. For a Frenchie who leans into the leash the whole walk, the Front-Clip No-Pull Harness has a ring on the chest panel as well as one on the back. Its sizes go by weight, from 4 to 17.5 kg.

Three of our mesh vests side by side: this one closes at 57 cm, the others at 61 and 55

Some of you are choosing between this vest and its two closest cousins here. These are the numbers from each product page.

None of these is better than the others. They differ in how wide they close and where the buckle sits, so pick by the tape.

If grams are what you care about, the Knitted Vest Harness is cloth instead of mesh. It weighs 60 g in the M and 68 g in the L, with a chest of 34 to 54 cm.

Ten minutes indoors on day one, and a look at his fur after every walk

“She was just stubbornly sitting and wouldn’t move.” An owner wrote that about a 4-month-old puppy on her first walks in a harness. If yours does that, the fix is not a longer walk. It is the living room.

On day one, put the vest on, hand him a treat, and take it off after 10 minutes. On day two, keep it on for 20. On day three, clip the leash on and walk one lap of the hallway. Only then go outside.

On the third walk, stop after ten minutes and run two flat fingers under the strap again. A strap that fit in the hallway can sit differently on the pavement. On the tenth walk, look at the ring. It should still sit in the middle of his back, and the buckle should click shut without a fight.

After each walk, take the vest off and part the fur where the strap and the leg openings sat. Flattened fur, a shiny patch or pink skin shows where it rubbed. Loosen the strap or move it, and look again after the next walk.

If the skin is still red the next day, or he keeps licking one spot, call your vet. That is a job for a vet, not for a different vest.

Four dogs should skip this vest, and each has a better place to start

A dog over 7.5 kg (16.5 lb) is above what the XL is meant for. Look at the Front-Clip No-Pull Harness, which is sized by weight up to 17.5 kg, or the Step-In Harness, which closes to a chest of 58 cm.

A puppy of eight weeks is too small for the L. Its neck opening is 34 cm. The Puppy Harness XS is cut for a neck of 27 to 31 cm and a chest of 32 to 37 cm.

A dog who pulls hard needs a ring on the chest. That is the Front-Clip No-Pull Harness again. A dog who hates things over his head needs the Step-In Harness.

If none of those is your dog, this is a plain, light vest. It holds a small dog on a 1.2 m leash and shows up in headlights at 5 p.m. That is all it does.