Bruce the bat dog joined the Washington Nationals for his first big league assignment, an honorary bat retrieval.

Geneticists are still on the hunt for an explanation. In this age of modern domestication, why are the largest dog breeds up to 40 times bigger than the smallest? While the answer remains unclear ...

While some dogs are quite small, like the Chihuahua or the Yorkshire Terrier, others tower over the rest with long legs and ...

But some of the most loyal and loving pups aren’t small or even medium in size. They are large — actually, they are some of the largest dog breeds in the world. Don't believe us? Just take a look at ...

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 ...