Nothing! Chihuahua's are pure-breds. They are the original breed, nothing was combined to make them.
kind of big.
It's a nickname for the cross breed that is mix of chihuahua and pomeranian.
a chihuahua and a pitbull with a little bit of poodle
You take a chihuahua and a pug dog and mix breed them
A pomchi is a k-9 breed, a mix between a pomerainian and a chihuahua.
All dogs have hair, but if you mean LONG hair, only if the chihuahua was the long haired breed.
chihuahua puppies will be small if it is the mother. if it was a male, it could breed with a large dog but it would be bigger but be a medium size
about 5 or 6 pounds
A chihuahua grows up to 7-10 inches about
The name of a Poodle Chihuahua mixed would probably be a Choodle or a Pihuahua. If you are interested in this breed of dog, you should probably research about what this breed would be like. Some of the breeds physical traits would probably be a puffy Chihuahua. If you find the Choodle of your dreams, enjoy your puppy!
first i would say that you need to check your papers. if they are just state ownership papers that doesnt mean your dog is a chihuahua. if you have akc (american kennel club) papers for a purebred chi then it is a chihuahua. second your dog might possibly be a mix breed. third nonetheless 18 pounds is way too much for a chi. unless it is indeed a mix. find out from whoever you got your dog from if there is any chance of it being a mix breed dog and, if it is truley only chihuahua, it needs to go on a diet.