Meet the tennis ball dogs!

Move over ball girls and ball boys - here come the ball dogs!

Meet the four legged friends who've been helping out at a tennis tournament in London.

They're assistance dogs for people with physical disabilities, and as part of their daily routine they pick things up to help their owners.

So they thought they'd try their paws at working on a tennis court too.

Watch them take on their new roles in front of the cheering crowds.