And Flatt's rescue - a group that specializes in difficult cases - had no space for the dog.
In fact, Flatt had nearly forgotten about Cascade when he stopped in at the shelter for a visit this week. Flatt had been called in to look at another dog.
But shelter staff leapt at the chance to introduce him to Cascade.
"They let her out of her little room and she came flying over to me, dragging her legs," he says. "She was kissing my face and wanting to play. And I was like, 'This dog has a zest for life.'"