My 1 year old Yorkie got into a squabble with another Yorkie yesterday. Immediately afterward, she was limping, favoring her back right leg. There are not teeth marks or wounds that we saw, nor swelling. Today she limping after squatting to go to the bathroom and other excitement. We are hoping that it is just a strain. What should we do to treat this or do you reccommend seeing our vet? Could this be permanent?