Do chihuahua poodles grow big

It depends on the size of the parents. I would guess that it was a cross of a Toy Poodle and a Chihuahua, both of which are relatively small, making a Chihuahua-Poodle relatively small (less than 10 lbs). Please take care of your pets and I hope you adopted your dog because there is no such thing as a designer dog or a teacup dog.