When I got this dog, I was told it was only 2 years old, but that doesn't seem to be the case. She is lazy and loves to sleep. She is very protective of the other dog we have, which makes me think she's had puppies at some point in her life. She enjoys walks, but doesn't walk as much as she use to when we first got her. She also won't eat pieces of food if they are too big (not sure if this helps narrow down an age). She has gray around her face, down her neck and over her back. I want to know how old she is, I don't know a lot about this dog breed aside from that they live to be about 15 so I'm not sure when they start to get gray or lazy. If anyone has a Chihuahua and knows how old she might be, I would really appreciate an estimate!
The best way to determine your dog's age is by their teeth. Look at your dog's back teeth. At the age of 1 to 2 you will notice slight yellowing on the back teeth. By the age 3 to 5 you should see tarter building up on the back teeth. Also check the teeth for wearing. When the dog is around 5 to 7 years you might see a lot of worn or missing teeth. A senior dog starts showing aging around 8 or 9 years and you can see some graying hairs around the head, face, muzzle and body. You can also notice some stiffness in the dog. Other than this the vet can give you a better estimate of your dogs age.
Poehere is on par with the teeth. Here is a complete guide:
Looking at the teeth is the best way. 42 permanent teeth mean the dog is at least 7 months old. Cuteness.com has an excellent article about this :www.cuteness.com/
Your vet is the best one to help you determine your Chihuahua's age and also to check if there are any problems with her heart. Heart problems are the number one killer of Chihuahuas.
Changing in fur color does not seem to be a good judge of age (unless there is a lot of graying) as genetics and other things can determine how soon the fur will change color.
Chihuahuas are very protective of other animals they are attached to and also certain people so that attribute is not a good sign that she has had puppies - but that is something else your vet can tell you right away.
My son has had 4 Chihuahuas and they all acted different at the same stage in life so your vet is still your best bet for determining her age. He can look at her teeth and tell you approximately how old she is.
Here is a link that has some good suggestions about what to look for at certain ages - this information may help you.