Here are some examples:
* Chihuahua: Known for being the smallest dog breed, some Chihuahuas can be as small as a teacup.
* Yorkshire Terrier: While they can grow to be a bit larger, some Yorkies stay very small, fitting in the palm of your hand.
* Pomeranian: These fluffy dogs can be tiny, with some weighing less than 3 pounds.
* Miniature Pinscher: While not as small as a Chihuahua, Miniature Pinschers can be compact and fit in a hand.
It's important to note that even within these breeds, there can be significant size variation. And of course, a dog's size will also depend on its age and health.