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.
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
All dogs have hair, but if you mean LONG hair, only if the chihuahua was the long haired breed.
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.