Scabbers

In the latest volume, Harry Potter and the Prisoner of Azkaban, a scruffy but harmless-looking pet rat called Scabbers turns out to be a wicked wizard who, even in human form, has a "pointed nose and… very small, watery eyes."

Not for Muggles Lurie, Alison 1999

The same thing happened to Ron Weasley with "Scabbers" the pet Rat.

Glad to be Alive 2007

I hadn't really thought about what happens to him, I just wanted the opportunity to tag Joe with the nickname "Scabbers."

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But primarily it was so that there would be a picture of the family--with Scabbers--in the newspaper for Fudge to give to Sirius when he visits Azkaban.

Bringing things full circle. cheeringcharm 2005

'Or a new cauldron, Charlie's old one's rusting through, or a new rat, you always liked Scabbers -

Harry Potter and the Order of the Phoenix Rowling, J. K. 2003

Ron's old rat, Scabbers, was here no more, but instead there was the tiny gray owl that had delivered Ron's letter to Harry in Privet Drive.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

He had moaned continually about his old rat, Scabbers, but had been most upset when Hermione's cat, Crookshanks, appeared to have eaten him.

Harry Potter and the Goblet of Fire Rowling, J. K. 2000

"Can you believe our luck?" said Ron miserably, bending down to pick up Scabbers.

Harry Potter and the Chamber of Secrets Rowling, J. K. 1999

"Positive," said Hermione, shifting Scabbers the rat so that she could sit down on the end of Ron's four-poster.

Harry Potter and the Chamber of Secrets Rowling, J. K. 1999

Ron's magic wand was lying on top of a fish tank full of frog spawn on the windowsill, next to his fat gray rat, Scabbers, who was snoozing in a patch of sun.

Harry Potter and the Chamber of Secrets Rowling, J. K. 1999