My 3 yr old siberian husky is not acting right. He is usually very excitable and happy to see people. Today he was laying outside in the same place for a very long time. When I approached him, he did not get up and he looked very upset (ears back). He finally got up after much prompting and he is walking very funny. He is taking tiny steps and walking very very slow. It is hard to get him up and when he stands he wants to lay right back down. I had to carry him up and down the stairs to go outside. He attempted to go back up them and he fell. I am not sure what could be the problem, but i am very concerned... Is there a possible medical condition that could cause this? It has happened before a couple months ago, but it was different. He would cry when he walked and it seemed like his back legs were hurting him. What could be wrong? Help please!