The biggest concern is that they're getting huge 'cos owners feed them fattening treats and snacks.
Fat rabbits have all sorts of problems like:
Lack of exercise
Not having babies
Getting too hot
Rabbits kept indoors can also get terrible "gruesome teeth" because they can't chew on grass to keep their gnashers in shape, said staff from animal charity, the People's Dispensary for Sick Animals (PDSA).
The charity is asking people with pets to think about how they care for them and to ask their vet if they're unsure.