Philosoraptor

Fun fact- in one of the movies (still trying to figure out which one), one of the students owned a Bearded Dragon.

What was its name?

Idk

[SPOILER WARNING: DO NOT READ IF YOU DON'T WANT ANY SPOILERS!]
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It was a "family pet", who was really Peter Pettigrew, AKA Wormtail, who ratted on the Potters... Meaning he's a rat, both literally, as he's an Animagus, and figuratively.

I know but if the teachers thought he was a rat...

Lupin suspected it. (6th year.)

3rd and he wasn't working there at the time Ron first went to Hogwarts