Your dog may be chewing on the stairs because he is teething. If your dog is a puppy this is a likely cause. When you see the dog doing this, say no and give the dog something safe to chew on. Your dog may also be chewing on the stairs because he is bored. Try playing with the dog, and giving him interesting toys to play with.
there is a special spray so the dog will stop chewing anything you spray the spray on..........you can get the spray at petsmart
They entertain the dogs so you dont have to 24/7 and a dog chewing up a toy is much better than a dog with no toy chewing up furniture.
You could take your dog to a trainer.
Yes, a dog who has hip dysplasia can climb stairs if a hind leg is lame.
nope.
cut them off.
It could have something wrong with its teeth
Yes
from shock
Possibly the dog has had a bad experience with stairs in the past. Often all it takes is one traumatic event to create a permanent impression on a dogs mind. It should be possible to work through this by helping the dog climb stairs with a lot of encouragement from you. Help the dog feel safe and assure it that it is alright and that stairs are a good thing. Treats can help along with time and patience.
it has vampire fleas
You.. You're joking... right?