My dog is 8 year old chihuahua and it is over-weight. He doesn't like exercise and lately he's been experiencing some problems.
He has been limping for three days now and since he is not active, I don't believe it has sprained anything. I've done some research and I think it could possibly be Degenerative Joint Disease (Osteroarthiritis).
Please help me, this dog is the first dog I ever had and it breaks my heart to see it hurt.