I have a Schnauzer (6) who over the past 2 weeks has not been able to jump. he is walking up steps slowly will not jump up on chair or couch. does play with his sister and runs around but will not jump up to greet, or on funiture. He has always been allowed to be on furniture. and has alway greeted family members by jumping up. we did not take him to vet because other than walking up stairs slowly and not jumping he is as active as he has always been.