I have a chihuahua puppy who is almost 3 months old. I have been reading about their ears because he only has one ear standing right now. I came across 2 articles that said that these people took their chihuahua puppies to the vet and they pulled the puppy's baby teeth that didnt fall out. Is that common in chihuahua's or any other dogs? If so, how will I know if he needs that done? He only has one ear standing, but I believe its still early for him and hes most definitely in the teething stage since he's not even 3 months yet.
You only need to pull the baby teeth if they don't fall out. I like to give them until 9-12 months to decide. Of five chihuahuas I'v had (and the 4 puppies raised who other people have), only one had teeth pulled (at 9 or 10 months), I let my other one go a little longer and they came out on their own. Usually the teeth you will see a problem with are the canines (generally the upper set more so than the lower).
As for ears, did the ear ever stand to your knowledge (it may have stood at the breeders before you got him)? If it has it will stand. If it hasn't, there is still a very good chance it will. Some chis take longer for their ears to stand and some have them stand and fall until one day they stay up. I have one that took almost a year before his ears stayed up and then if he was really asleep, they'd flop again. Now at 6 his ears are never floppy.