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

This is the largest weight spread in any Collie comparison you'll find on this site: a Mastiff can weigh 120-250 lbs, more than three times a Collie's 50-75 lbs, and stand up to 32 inches. Both are technically listed with overlapping size descriptions, but large and giant undersell it; a full-grown English Mastiff is closer in mass to an adult human than to a Collie.

Counterintuitively, the bigger dog wants less activity: the Mastiff rates a low 2/5 on exercise need against the Collie's moderate 3/5, and its energy level rates lower too (2/5 versus 3/5). Mastiffs are famously low-key for their size, content to lounge for most of the day. If you pictured a giant dog needing giant exercise, the data says otherwise; it's the Collie that actually asks more of your schedule here.

The Mastiff's short coat needs almost no maintenance: 2/5 grooming need against the Collie's 4/5, and it sheds moderately (3/5) rather than heavily. The tradeoff the numbers don't show is drool; Mastiffs produce plenty of it, which is its own kind of upkeep. If brushing is what you're trying to avoid, the Mastiff wins clearly; if you're avoiding mess generally, neither dog is spotless.

Both breeds rate the same low 2/5 for apartment suitability, though the Mastiff barks far less (1/5 versus the Collie's 3/5); it's simply too large for most small spaces regardless of temperament. A 200 lb dog needs floor space to lie down comfortably, let alone move around. If you're in an apartment, this comparison should point you elsewhere entirely.

The Collie is the easier dog to raise: 5/5 trainability and 4/5 for first-time owners, against the Mastiff's 3/5 and 2/5. A Mastiff's size means training isn't optional; an untrained 200 lb dog that pulls on a leash or jumps on guests is a genuine safety issue in a way a Collie's mistakes rarely are. This isn't a beginner's breed by the numbers.

Both score a perfect 5/5 with kids, reflecting the Mastiff's famously gentle, patient nature despite its size. The Collie edges ahead with other dogs (4/5 versus 3/5) and strangers (4/5 versus 3/5); the Mastiff's more reserved, protective instincts show up here. Supervise young kids around a Mastiff anyway; gentleness doesn't cancel out the physics of a 200 lb dog moving through a room.

Giant size takes its toll on lifespan: the Mastiff lives just 9 to 11 years against the Collie's 11 to 14. Both share hip dysplasia, bloat, and progressive retinal atrophy risk, but the Mastiff's list adds dilated cardiomyopathy and bone cancer, serious conditions more common in giant breeds. If you want more years with your dog, the numbers favor the Collie clearly.

Keeping a Mastiff is expensive: rated 5/5 (Very high) versus the Collie's 3/5, with a monthly range of $150-$350 against $100-$200 and a first-year cost that can hit $4,500 versus the Collie's $2,800 ceiling. Food volume alone for a 200+ lb dog is significant, and vet care, medication dosing, and even a large enough crate all scale with size and price.