Bullmastiff size chart: crate, harness & collar
What the published charts say for a Bullmastiff, across 19 harnesses, 6 crates and 7 collars. Every answer says how it was reached, and none of them replaces measuring your dog.
Adult Bullmastiff
- Height at the shoulder
- Male 25–27 in63.5–68.6 cm
Female 24–26 in61–66 cm - Adult weight
- Male 110–130 lb49.9–59 kg
Female 100–120 lb45.4–54.4 kg - Chest girth
- not published
- Neck
- not published
AKC prints: “Height: 25-27 inches (male), 24-26 inches (female)”, “Weight: 110-130 pounds (male), 100-120 pounds (female)”.
Source: AKC breed page, checked Nov 4, 2026.
No published chest or neck girth was found for this breed. Girth is never worked out from weight or height here, so the tables below fall back to weight where a maker prints it, and say so.
These are published breed figures, not your dog. Measure your dog — chest girth for a harness, neck for a collar, length and height for a crate.
Sized for a male Bullmastiff
Harness sizes
| Harnesses (19) | Size | How it was worked out |
|---|---|---|
| Julius-K9 IDC Powerharness | 3 | by weight only, less reliable |
| Ruffwear Front Range Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Ruffwear Flagline Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Ruffwear Web Master Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Kurgo Tru-Fit Smart Harness (quick release) | X-Large | by weight only, less reliable |
| PetSafe Easy Walk Harness | Extra Large | by weight only, less reliable |
| PetSafe Easy Walk 3 in 1 Harness | Large | by weight only, less reliable |
| Rabbitgoo ControlPro No-Pull Harness (ControlPro series) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Blue-9 Balance Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| 2 Hounds Design Freedom No-Pull Harness | 1" XLarge or 1" XXLarge | by weight only, less reliableBetween sizes. The maker says: “choose the SMALLEST size that fits the chest measurement” |
| Wild One Classic Cushioned Dog Harness (with neck buckle) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Wild One Step-In Dog Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Voyager (Best Pet Supplies) Step-In Air Pet Harness | No size | by weight only, less reliableVoyager (Best Pet Supplies) lists no Step-In Air Pet Harness size for over 28 lb. Check with Voyager (Best Pet Supplies). |
| Gooby Comfort X Head-In Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Puppia RiteFit Harness (PAJA-AC617) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Puppia Soft Harness (PDCF-AC30) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Chai's Choice Outdoor Adventure Dog Harness (3M reflective) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Embark Adventure No-Pull Harness | XL | by weight only, less reliable |
| Carhartt Training Dog Harness (Nylon Duck Training Harness, PH0341) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
Rows marked “by weight only” had no published girth to work from, so the maker’s weight bands were used. That is the weaker route, and two dogs of the same weight can need different sizes.
Crate sizes
| Crates (6) | Size | How it was worked out |
|---|---|---|
| MidWest Homes for Pets iCrate Single Door Folding Dog Crate | 48-inch | by weightMidWest Homes for Pets lists the outside of the box; the usable inside is smaller. |
| MidWest Homes for Pets LifeStages Single Door Dog Crate | 48-inch | by weightMidWest Homes for Pets lists the outside of the box; the usable inside is smaller. |
| Petmate Sky Kennel | 48" | by weight |
| Diggs Revol Collapsible Dog Crate | No size | by weightDiggs lists no Revol Collapsible Dog Crate size for over 90 lb. Check with Diggs. |
| Impact Dog Crates Collapsible Dog Crate | Sizes by measurement only | Impact Dog Crates publishes no dog weight. Use the crate calculator.estimated interior, about ½ in smaller than Impact’s exterior size (Impact’s own note) |
| Frisco (Chewy) Fold & Carry Single Door Collapsible Wire Dog Crate | X-Large | by weightFrisco (Chewy) lists the outside of the box; the usable inside is smaller. |
Every crate row above is by the maker’s weight guidance, because no published body length exists per breed. A crate is sized on the body: use the calculator below with your own measurements.
Collar sizes
| Collars (7) | Size | How it was worked out |
|---|---|---|
| Ruffwear Front Range Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Blueberry Pet Classic Solid Color Adjustable Dog Collar | No size | by weight only, less reliableBlueberry Pet lists no Classic Solid Color Adjustable Dog Collar size for over 85 lb. Check with Blueberry Pet. |
| PetSafe Martingale Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Max and Neo Martingale All Nylon Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Wild One Waterproof Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| 2 Hounds Design Side Release (Buckle) Collar / Buckle Martingale | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Carhartt Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
Rows marked “by weight only” had no published girth to work from, so the maker’s weight bands were used. That is the weaker route, and two dogs of the same weight can need different sizes.
Sized for a female Bullmastiff
Harness sizes
| Harnesses (19) | Size | How it was worked out |
|---|---|---|
| Julius-K9 IDC Powerharness | 3 | by weight only, less reliable |
| Ruffwear Front Range Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Ruffwear Flagline Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Ruffwear Web Master Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Kurgo Tru-Fit Smart Harness (quick release) | X-Large | by weight only, less reliable |
| PetSafe Easy Walk Harness | Extra Large | by weight only, less reliable |
| PetSafe Easy Walk 3 in 1 Harness | Large | by weight only, less reliable |
| Rabbitgoo ControlPro No-Pull Harness (ControlPro series) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Blue-9 Balance Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| 2 Hounds Design Freedom No-Pull Harness | 1" XLarge | by weight only, less reliable |
| Wild One Classic Cushioned Dog Harness (with neck buckle) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Wild One Step-In Dog Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Voyager (Best Pet Supplies) Step-In Air Pet Harness | No size | by weight only, less reliableVoyager (Best Pet Supplies) lists no Step-In Air Pet Harness size for over 28 lb. Check with Voyager (Best Pet Supplies). |
| Gooby Comfort X Head-In Harness | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Puppia RiteFit Harness (PAJA-AC617) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Puppia Soft Harness (PDCF-AC30) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Chai's Choice Outdoor Adventure Dog Harness (3M reflective) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Embark Adventure No-Pull Harness | XL | by weight only, less reliable |
| Carhartt Training Dog Harness (Nylon Duck Training Harness, PH0341) | No size | no sizeNo published chest girth for this breed, and this maker does not print dog weights. Measure your dog. |
Rows marked “by weight only” had no published girth to work from, so the maker’s weight bands were used. That is the weaker route, and two dogs of the same weight can need different sizes.
Crate sizes
| Crates (6) | Size | How it was worked out |
|---|---|---|
| MidWest Homes for Pets iCrate Single Door Folding Dog Crate | 48-inch | by weightMidWest Homes for Pets lists the outside of the box; the usable inside is smaller. |
| MidWest Homes for Pets LifeStages Single Door Dog Crate | 48-inch | by weightMidWest Homes for Pets lists the outside of the box; the usable inside is smaller. |
| Petmate Sky Kennel | 48" | by weight |
| Diggs Revol Collapsible Dog Crate | No size | by weightDiggs lists no Revol Collapsible Dog Crate size for over 90 lb. Check with Diggs. |
| Impact Dog Crates Collapsible Dog Crate | Sizes by measurement only | Impact Dog Crates publishes no dog weight. Use the crate calculator.estimated interior, about ½ in smaller than Impact’s exterior size (Impact’s own note) |
| Frisco (Chewy) Fold & Carry Single Door Collapsible Wire Dog Crate | X-Large | by weightFrisco (Chewy) lists the outside of the box; the usable inside is smaller. |
Every crate row above is by the maker’s weight guidance, because no published body length exists per breed. A crate is sized on the body: use the calculator below with your own measurements.
Collar sizes
| Collars (7) | Size | How it was worked out |
|---|---|---|
| Ruffwear Front Range Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Blueberry Pet Classic Solid Color Adjustable Dog Collar | No size | by weight only, less reliableBlueberry Pet lists no Classic Solid Color Adjustable Dog Collar size for over 85 lb. Check with Blueberry Pet. |
| PetSafe Martingale Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Max and Neo Martingale All Nylon Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Wild One Waterproof Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| 2 Hounds Design Side Release (Buckle) Collar / Buckle Martingale | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
| Carhartt Dog Collar | No size | no sizeNo published neck girth for this breed, and this maker does not print dog weights. Measure your dog. |
Rows marked “by weight only” had no published girth to work from, so the maker’s weight bands were used. That is the weaker route, and two dogs of the same weight can need different sizes.
Puppy?
Size for the adult and use a divider. A crate bought to fit a puppy is outgrown in weeks, and a crate with a spare end stops working as a den. Buy the adult size and move the divider back as the dog grows. A harness or collar is the opposite: buy for the dog you have now, because adult-sized straps slip on a puppy.
Is your dog a mix?
Mixes vary a lot. Measure your dog. A breed figure describes a published standard, and a mix is not held to one. Two dogs from the same litter can land two sizes apart on the same chart.
Measure your Bullmastiff
The tables above start from a published breed range. This starts from your dog. Crates need a body length and a standing height, plus 4 in of room.
Size your Bullmastiff
Enter what you have measured. Every answer below is the maker’s own published range against your number — a starting point, not a fitting.
No chest or neck girth is published for the Bullmastiff, so there is nothing to compare against here.
Measure your dog and enter it. A published range is a range: the boxes below stay empty because the middle of a range is a number nobody published. Full Bullmastiff size chart
Where to put the tape. Leave a box empty and the answers that need it say so, rather than guessing.
Enter a measurement above to see what each maker's chart says.
Sizes come from each maker’s own published chart. Check the maker’s current chart before you buy: charts change, and nothing here is a guarantee of fit.
Common questions
- What size harness for a Bullmastiff?
- On the charts published by their makers, a Bullmastiff comes out at Julius-K9 IDC Powerharness 3, Kurgo Tru-Fit Smart Harness (quick release) X-Large, PetSafe Easy Walk Harness Extra Large (by weight only, which is the weaker route), with 6 of 19 charts giving a size. Size labels are not comparable between brands, so read the range rather than the letter. Measure your dog's chest girth at the widest part of the rib cage and check it against the maker's own chart before you buy.
- What size crate for a Bullmastiff?
- By the makers' own weight guidance, a Bullmastiff comes out at MidWest Homes for Pets iCrate Single Door Folding Dog Crate 48-inch, MidWest Homes for Pets LifeStages Single Door Dog Crate 48-inch, Petmate Sky Kennel 48". Weight is the rougher route: a crate is sized on the body. Measure your dog from the nose to the base of the tail and from the floor to the top of the head while standing, add 4 inches to each, and compare that with the crate's interior, not its outside.
- How big does a Bullmastiff get?
- An adult Bullmastiff is 25–27 in tall at the shoulder for males and 24–26 in for females, 110–130 lb for males and 100–120 lb for females. No published chest or neck girth was found for this breed. These are breed-standard ranges, not your dog: individual dogs sit outside them. Measure your dog.
Other giant breeds
Breeds in the same size group on this site. The group is worked out here from adult male weight; it is not an AKC category.
Compare every chart instead: harness size charts, crate size charts, collar size charts.