Another thing to consider is how long-lived chihuahuas are. It’s possible for a chihuahua to live into their 20s, and 12-18 is a lot more common. If you get your 10 year old a chihuahua as a pet, he’ll be working out what to do with it in college. Give grandpa a chihuahua, and you may well need to come up for a plan should the chihuahua outlive him. I personally love their ages, but it’s not something to take on lightly.