Mastiff (English Mastiff) vs Old English Sheepdog: Which Suits Your Home?

The Mastiff outweighs the Old English Sheepdog substantially, 120-250 lbs against 60-100 lbs, roughly double at comparable points in each range. Height is closer, 27-32 inches versus 20-24, but the weight gap alone puts these in different handling categories, one is a giant breed, the other a large one, and it shows in how much space each needs indoors.

The Sheepdog needs more exercise, 3/5 against the Mastiff's 2/5. Energy levels sit close together too, low (2/5) for the Mastiff, moderate (3/5) for the Sheepdog, neither breed is a high-drive athlete, but the herding heritage still gives the Sheepdog a bit more get-up-and-go day to day, especially as a younger dog.

This is where the Sheepdog demands real commitment: grooming rates a maxed 5/5, the highest score either breed carries in this comparison, against the Mastiff's low 2/5. Shedding follows the same pattern, Sheepdog high (4/5), Mastiff moderate (3/5). That long shaggy double coat is genuinely high-upkeep; expect regular brushing sessions or professional grooming bills that the short-coated Mastiff simply doesn't require.

Both breeds bark at a moderate 3/5, and neither fits small spaces well, Mastiff and Sheepdog both rate a low 2/5 for apartment suitability. The Mastiff actually tolerates being left alone a bit better, moderate (3/5) against the Sheepdog's low (2/5), notable since the Sheepdog's herding instincts can make solitude harder on it than its size alone would suggest.

Trainability ties at moderate (3/5) for both breeds, so neither is notably easier to teach. First-time-owner suitability is low across the board, 2/5 for the Mastiff, 2/5 for the Sheepdog, making this one of the rare comparisons where neither breed is a strong beginner recommendation. Both need an owner ready for size, coat, or both.

Both breeds rate very high with kids (5/5), a clean tie between two large, gentle breeds. The Sheepdog edges ahead with other dogs (4/5 versus 3/5) and with strangers (4/5 versus 3/5), its adaptable and playful temperament tags track with those higher social scores compared to the Mastiff's more reserved side.

The Sheepdog lives a little longer, 10-12 years against the Mastiff's 9-11. Three conditions overlap: hip dysplasia, hypothyroidism, and bloat (GDV), again a meaningful shared risk between two large, deep-chested breeds worth discussing with a vet. The Sheepdog's list also includes primary ciliary dyskinesia and cataracts, not listed for the Mastiff.

The Mastiff costs more to keep, 5/5 versus the Sheepdog's still-high 4/5, and the numbers back it up: $150-350 monthly against $110-240, and $2,200-4,500 versus $1,700-3,200 in the first year. Both are expensive breeds; the Mastiff is simply the more expensive of the two once food and vet sizing are factored in.