My 5 1/2 month old puppy chipped the tip of one of her lower canine teeth a couple of weeks ago. I didn't think much of it then, as she didn't seem in any pain at all, the loss didn't affect her chewing and the amount missing wasn't much. However, when I looked closely at the tooth yesterday, it has changed color and become somewhat darker. I can't take her to the vet 'til the first of next week. Has anyone else had this problem?