My dogs back legs went funny on friday and he was a bit lame when he was walking. He seemed to be alright after a wee while though. Ive just noticed this on his left hind leg and im worried its been a tick. If not what could it be? He has been chasing his tail a lot lately as well. He has the vets tomorrow to check his ear (separate issue) and his legs will be checked too. Ill be mentioning this to the vet tomorrow too. I do get i may be worrying and its nothing but want to be safe than sorry