My dog has a lump a little bigger than a golf ball any ideas what it might be please help?

-it is on her back legthis might be a tumor so take the dog to the vet to have a check up about it , my dog had a lump at the back of her mouth the same size as a golf ball so we took her to the vet and they gived her some anti biotic tablets and now it's gone so i hope this happens with your dog as well good luck with your dog i hope it goes ! :) i hopped this helpedIt could be a cyst, a tumor, or an internal infection if she's had any puppies in the past several months. You should definitely take her to the vet, stat!
Have a vet check it out. Could be a tumor or a cyst. Either way a vet can determine what it is.
Did she hit her leg somehow? Maybe it's swollen?

It could be a tumor or something related to that.
it could be a cancerous tumour. its really hard to tell over the internet. you should go to the vet.