In 2003 I adopted a chihuahua from a local group. He was quite big at 10 pounds and has a huge head. Most people think he's a miniature Corgi and he resembles a Corgi. Several years ago I met a lady from Mexico who told me he was a terrier chihuahua and that she had had several of them growing up. I've never heard of a terrier chihuahua but I'd like to know the history of the breed. He is registered as a chihuahua. He's quite aggressive. I call him "the Little General" because he's quite fierce.