“She’s pretty much a perfect dog,” says Frost’s foster. OK, but can a perfect dog become even more perfect? If you’re Frost, the answer is like, well, obviously. Equal parts smart, sweet and wiggly, this Schnauzer / Terrier mix is somehow becoming an even better buddy who’s learning how to play with dog friends, has started sleeping in her crate (“BY HERSELF,” her foster adds) and is becoming increasingly energetic. She’s treat-motivated, and everyone who meets her remarks on her astounding smarts, soon, she’ll be writing SATs in exchange for a handful of Benny Bully treats. Plus: how good does she look in a sweater?