I have a 3 yr old Jack Russel x Mini Foxy and today he began to pant more than usual, walk slowly, laydown and drag his hind legs, while standing extend/stretch his right back leg and stopped eating. We thought he was bitten by a spider so we took him to the vet. The vet massaged his back but couldn’t find anything. He was given anti-histamine which has calmed him down. Now that we are home he is very tired but every time I move he follows. ATM he is sitting right next to me when usually he is on his mat. The only explanation I can find is either a pinched nerve or slipped disk. Since he doesn’t seem to be in pain and the vet couldn’t find anything, does anyone have any other suggestions??