Hello, yesterday I became the owner of a chihuahua. I have two boxers, but use to have a little chihuahua mix. Well, last week we passed a little chihuahua on a busy highway near our home. I asked my husband to stop to pick him up so he would not get hit, but we were going to fast and it was too dangerous to stop. Well, my husband was waiting to meet this guy yesterday for some contract work he was doing at the animal shelter here, and got bored so he looked around. Well, the little guy was there. The chihuahua was very scared of everyone there (he had been there over a week), but they let him out to run around and he immediately took to my husband, following him all around. So the dog came home with us. We are guessing he is about 4 to 6 years old, but know nothing else about him. He seems to be a bit aggressive (I think out of fear) toward my other dogs, but has not tried to bite them. He is also not housebroken and I don't think he knows anything (no training whatsoever). He is on the thin side and I think he might have broken a rib a long time ago because it kinda juts out strangely. He is a sweet little dog and really loves my husband. Anyway, I will be asking tons to questions as I have no clue how to train such a little guy who is a bit on the older side.