I have 1 year old chihuahua who this past was in his usual state of health. This past Saturday morning he woke up walking funny in on his back paws and kept swaying his head back and forth toward his backside. Took him to vets who excreted his anal glands (first time getting done). Also was started on temaril p for allergies. Also recently did his flea and tick treatment canone advantix II on Friday last week. Since Saturday my dog is still swaying his head back and forth only when he is walking. He is eating and sleeping fine. Any advise or concerns I should have about this behavior?