She's a 7 1/2 week teacup chi...just haven't noticed any poopy since last night....
No such thing as a teacup chihuahua. Chihuahuas have no minimum size in their breed standard so "regular" chis can stay quite tiny.
How long have you had your puppy? Is she usually pretty regular with pooping? Is she eating normally?
Are you sure about her age? Did you get her from a reliable source? I only ask because a lot of bad breeders sell "Teacup Chihuahuas" that are actually just very young chis, way too young to be leaving the breeder's. I knew of one owner who bought a chi from the breeder thinking it was 8 weeks old, but actually it was FOUR weeks old :yikes: WAAAAAY too young to leave mamma. But that could also explain constipation.
Have you taken her to the vet since you've had her?
How many times a day are you feeding her?
Is the puppy staying hydrated? Make sure she's getting lots of water. If she won't drink very much try giving her ice cubes. Some dogs really love licking ice cubes and it's a good way to keep her hydrated!
You could always try this, but most chis are too cold-natured to appreciate ice cubes. My chi, Luna, likes warm chicken broth.