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Any animal of the Canine species that fits into a standard sized microwave.

Yapping, whining, biting ankles, and fitting into small purses are common amongst these animals.
KellEy: Check out my new puppy! She's a Chihuahua Yorkie mix.

Hailey: It's cute now, but just wait until it becomes a full-sized Rat Dog...

*KellEy hits Hailey
Rat Dog by HaileyM January 2, 2010
A very small dog, usually less than 10 or 15 pounds, usually short-haired but not always. Usually not of much practical use as a watchdog or protector, but kept mainly as a companion by little old ladies, gay men who don't like cats, and Paris Hilton. Includes such breeds as the Chihuahua, the Miniature Pinscher, the Rat Terrier and other similarly sized breeds.
"That rat dog is 3 years old and he isn't housebroken YET?"

"I swear, if that rat dog tries to bite me again, I'll stuff him in a sock and hang him up as cat bait!"
A insult people would use on people that looks musty, dirty, or messy.
Did you see Carson today?? He looks like a rat dog lmao.”
Rat dog by Davae06 November 5, 2021
n. hot frankfurter (of unknown origin), wrapped in bacon, eaten in a long roll with grilled onions and peppers at 2:00am after the club.

The profiteers of these rather disgusting snacks set up outside of Los Angeles clubs, waiting for drunk patrons. They are notorious for cheating wasted customers of their change.
"Yo bitch, gimme my change...I ain't paying $10 for dis fucking rat dog!"
Rat Dog by AA Factory June 24, 2005

You rat dog cunt 

A phrase to use against the filthiest of human
Nathan Spits in Lockier’s sandwich, “Fuck off Nathan you rat dog cunt”
You rat dog cunt by Richardhotones November 12, 2020

fat smelly rat dog 

A fat smelly rat dog is a small dog that’s fat, They are usually under 35 pounds and look like a rat. they also smell bad like really bad.
ewww your dog is such a fat smelly rat dog, it’s disgusting give he/r a shower! 🤮
fat smelly rat dog by luna tuna September 21, 2020