Is this something that I should be concerned with? I know that dogs start losing their teeth as they get older, but my ****zu is only 6 years old so I find this a bit alarming. So far he has lost his 2 front teeth. I think that the reason for this might be because of the new addition in our family. We recently brought a new ****zu puppy into the household and there has been some sibling rivalry between the 2 ****zus. They are constantly pulling chew toys out of eachother's mouths, so I am guessing that this has caused the older ****zu to lose his teeth since they are weaker. Anyone have any suggestions, is this something that I should take him to a vet for? TIA!