Since my chi was a rescue I pulled off the street out of traffic, I have no way of knowing his exact age. Is there any reliable way of trying to figure it out without knowing any background such as diet etc? Other than knowing he was at least one year since he had all his adult teeth and was his full size, I have no idea. He's obviously a young dog. Since I don't know his background, I'm trying to assign him an unofficial birthday, but don't know when I should make it. I don't know if he will be two years old, or maybe even three (though I tend to think closer to two). Or assuming he will be two on his next birthday, if that's closer to being in the next month or not for another three or four or more. Any ideas judging by how he looks in the pics in his album?