OK, OK, I'm stumped again. What does rat fink have to do with a cute little maltese puppy?

Of course, I'm the guy who needed an explanation on the motorcycle one, but this one truly has me stumped. Maltese = rat fink?
Cartoon.
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Mike ~ Doting Dad to Jillie, Harper, Molly, Cooper, Eddie (RIP), Lucy (RIP), Rusty (RIP) and Jack (RIP).
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