that question would be hard to answer but my chihuahua is pretty smart and since they have big heads they can hold big brains so i am guessing they have big brains
theres no such thing as a "teacup" > http://www.cnmchihuahuas.com/teacup.html most people think they are getting a teacup animal when really its just a normal sized one but its a puppy and it will...
The biggest chihuahua grew to about, the size of a big milk carton. ADD TO ANSWER: - Depends on the dog...how much exercise they get...and their diet. I just adopted my long haired chihuahua when my...