my german shepard is almost 10yrs old. out of nowhere she started limping on one of her back legs then it started getting worst and now she just wont get up she cries all day. she wont eat unless we bring it to her. she just lays in the backyard and cries. She looks so sad and in pain. Shes getting skinnier and she wont move she struggles to go to the bathroom and is having runny poop but we have been giving her med. for bones. i dnt know whats wron with her? help me please.