My friend's birthday is very soon, I thought about a teacup puppy as a gift for her. What do you think ? 

http://petsfans.com/cute-puppy-will-blow-mind/

I think this is a lovely idea but only if she has wanted a pet for a long time and will keep it forever. Make sure your friend is prepared and able to look after it and talk to the people they live with to make sure they are happy to have a dog in the house and that no one is allergic. As long as they can look after the dog and will want to look after it, then it's okay.

If you have any doubts at all,don't do it, because it's the puppy that will suffer.

Not a good idea... For the reasons the others state.

Also, if your friend is a minor you would need her parent's permission.  And if she's an adult, you would need to know if the place she is living even allows pets.