Border Collie vs Mastiff (English Mastiff): Which Suits Your Home?

The Mastiff is one of the largest breeds featured on this site -- 120 to 250 pounds and up to 32 inches tall, dwarfing the Collie's 30-55 pounds and 22-inch max. A large adult Mastiff can weigh as much as four or five Collies combined. This is a genuine giant-breed comparison, and it colors everything from food bills to furniture choices.

The energy gap runs opposite to what the size suggests: the Collie rates a maxed-out 5/5 for both exercise need and energy level, while the Mastiff sits at a low 2/5 on both counts. Mastiffs are famously low-key for their bulk -- content to lie across a doorway for most of the day, which is nearly the opposite of Collie behavior.

Grooming favors the Mastiff, rated low (2/5) against the Collie's moderate (3/5) -- a short, dense coat needs less brushing than a double coat. Shedding, though, is a tie at moderate (3/5) for both, so the Mastiff's easier coat doesn't mean less hair around the house, just less time spent removing it before it falls.

Barking is where the Mastiff clearly wins -- very low (1/5) against the Collie's moderate (3/5), a genuinely quiet breed by temperament. It also tolerates being alone better, moderate (3/5) against the Collie's low (2/5). Apartment suitability still favors the Mastiff at low (2/5) versus the Collie's very low (1/5), but neither number is good -- a 150-plus-pound dog needs space regardless of how calm it is.

The Collie is the sharper trainee, rated 5/5 against the Mastiff's moderate 3/5, but neither breed suits a first-time owner well -- the Collie scores a very low 1/5, the Mastiff a still-weak low 2/5. A giant breed with a stubborn streak and a working dog with relentless drive both ask more of a new owner than most breeds on this site.

The Mastiff rates very high (5/5) with kids, ahead of the Collie's high (4/5) -- that gentle-giant reputation holding up in the data. Strangers are a tie at moderate (3/5). The Collie edges ahead with other dogs, high (4/5) versus the Mastiff's moderate (3/5) -- worth noting if you already have a dog at home.

Lifespan favors the Collie substantially, 12-15 years versus the Mastiff's 9-11 -- typical for a giant breed carrying that much mass. Hip dysplasia and cancer show up on both lists. The Mastiff's other risks lean toward bloat, heart disease, and bone cancer, all serious giant-breed concerns, while the Collie's lean toward epilepsy and cerebellar abiotrophy.

The Mastiff is the most expensive dog in this comparison, rated very high (5/5) on cost -- $150-350 a month and $2,200-4,500 in year one, against the Collie's moderate $100-180 and $1,500-2,800. A dog that can weigh 250 pounds eats and medicates accordingly, and vet costs for giant breeds tend to scale with body mass too.