My lhasa apso had really matted fur after coming back from the kennels, and after his fur had been shaved off (except for his tail) he's been acting really strangely. He doesn't play any more, doesn't perform tricks, doesn't chew on treats and bones, and isn't coming when called. He doesn't follow us around but scratches and licks himself all the time and rubbing his body onto furniture. He's looking really sad and it's been three days now and his behaviour isn't changing. He isn't peeing in our garden, only on grass. What shall we do?