If some videotape or book tells you that you can have a perfectly trained dog after one or two weeks, don't believe it! As well as being comfortable and relaxed, a sick dog also needs to have plenty of warmth. If your dog is chewing his hair, he may have an allergy. If you are taking it from outside, avoid soil; organisms on the ground could make their way into your dog's fecal material, resulting in an inaccurate reading. In this case, there are vitamin and mineral supplements that are specially formulated for your dog nutrition needs. Many dog owners seem to think that just because they are animals and not people, that anything goes when it comes to feeding them.
For example, if your dog is crated for a large portion of the day, allow him outside the confined space to help get him on the road to recovery.
They also can make mistakes. If for some reason your dog's bed area is in a place where it is a little damp or has a draft coming through, then consider adding some sort of heater beside him. If no help is available, make your dog lie down on his side and hold him as best you can, all the while talking to him soothingly.
These are signs that your dog has hit his late years in life.