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1.
A breed of dog ranging from standard size (13 to 18 inches at the shoulder) to minuture (13 inches and under)

Small dogs who -unlike Chihuahaus- don't have an annoying, yippy bark and are smarter than a bag of hair. Much smarter, really.

By show standards, a Rattie's tail should be docked (see-Animal Cruelty), but who wants a dog with a stubby tail?

A great, cute, entergetic dog, search Rat Terrier on youtube and see some videos of just how funny they are, if you had any doubts as to their awesomeness.
I love my Rat Terrier, Precious. She's kept me safe from evil mailmen for three years now! XD
by Figure.10 July 13, 2009
 
2.
A type of rat that looks almost like a dog.
Holy crap! What kind of ugly dog is that?
Oh, wait, its just a rat terrier.
by I WILL BEAT YOU WITH A STICK!! September 27, 2010