Full-grown brown Newfoundland sits in a field of yellow flowers. Image via Shutterstock / Pandas Newfoundlands are genuinely amazing dogs: they're excellent with kids and they're good with ...

How Big Are Newfoundland Dogs When They’re Full-Grown? Depending on their gender and genetics, Newfoundlands usually range in height from 26 to 30 inches and 100 to 150 pounds in weight ...

That's because Beetlejuice is a gigantic Newfoundland! These dogs weigh easily over 100 pounds when fully grown, and Beetlejuice is no exception. Still, he has no idea that lap dogs are usually small!