Call and talk to a vet. We have no idea. We don't know how old the dog is, how long this has been going on, etc. If your dog is important to you, then you need to call and see if they can help you via a phone call or do you need to take him in.
My dog is moving very slow walks alone walls only tong out of mouth a lot won't eat, won't stay, still looks tired has a hard time walking?