Chihuahuas are small, anyway. When you try to make them even smaller, you force all the dog’s internal structure into a smaller space. Teacup Chihuahuas often have brain issues, and many don’t ...
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32 fun facts about Chihuahuas
Tiny Chihuahuas are often referred to as “teacup Chihuahuas”, and it’s true that the puppies probably would fit in a teacup.