My neighbors have a Rat Terror...
I can sum ol' Shorty up with one word:
H - Y - P - E - R!!!!
He is a barker, a yipper, and an attempted ankle biter; but in spite of that is a pretty good dog. At least he is playful and does not guard things, nor does he bother their cats overmuch.
I like him just fine. But if I actually LIVED WITH HIM that assessment might not last too long!!!
A little obediance training would have done much to take the edge off of his nuttiness. But since he is by far the smartest member of that family, there's little chance of that happening...HE trains THEM, you see.
He is very much like a Jack Russell with longer legs and a slightly insane gaze.
It not may be entirely nice to say this; however, 'fun but freaky' is what honestly comes to mind with most of these dogs!!
And that mold is the very one the other few dozen Rat/Fox/JR Terrors I have met in my travels were made from, too.
Better than a MinPin or a Toy Poodle, though. A LOT better.