Many people have owned or known big dogs, from the gentle giant Great Danes to the sweet-tempered, bear-sized Newfoundlands.

Mastiffs are the largest dog breed, with males weighing up to 230 pounds. Large dog breeds are frequently known for being protective. Some large breeds require more upkeep than others, making it ...

A study published Wednesday in the journal The Royal Society found that large dog breeds, but not the largest ... shows a Bernese mountain dog. (Getty Images) The file image shows a bullmastiff.

Pictures of fully-grown Zeus sprawled across ... “Joint issues are a really big deal for large breed dogs,“ she explains. “Once you have a 200-pound dog that can't get up, that just doesn ...

Small breeds and large breeds generally have ... “They’re just dogs.” Cover photographs by Harry Choi/TongRo Images, Erik Lam, YAY Media, Life on White, Erik Lam/Zoonar GmbH, via Alamy.