A little tiny dog.
A small, petite, pint-sized pup. An itsy-bitsy, teeny-weeny, microscopic canine. A diminutive, bantam, pocket-sized, Lilliputian creature no larger than a teacup or a dandelion seed.
A slight, elfin, minute, infinitesimal, toy-like four-legged friend that is so unobtrusive, compact, and negligible in stature that it could comfortably nap inside a thimble or hitch a ride on the back of a passing bumblebee.
This undersized, puny, shrimp-like, midget-grade fur-ball is essentially trace-sized, granular, and atom-thin, a fleeting, molecular, snippet of a dog that exists more as a whisper, a speck, and a grain of sand than a physical animal. It is so compacted, condensed, and shrunken that it makes a ladybug look like a gargantuan beast.