No, it's not to late!! Don't give up on your dog, please. Sassy was overweight at one point, about 4 pounds. I know they are two different dog breeds, with different builds and all that. A toy dog that is overweight even a little is bad. But your dog isn't a toy dog. You can do many things to help her/him lose weight. Walks to start with. A run in the yard, fetch, swimming sessions in a indoor pool. If your lab isn't dog aggressive or anything can you take her to a local park/dog park? That would help alot! Especially running around and playing with other active dogs. Good luck! Keep us posted.