Sirius as a dog

[Goddlefrood]

No: HPFGUIDX 181046

> Potioncat:
> It appears that Snape doesn't learn of the Marauders' animagi 
> tricks until the end of GoF, when Sirius transforms in front 
> of him. He may have heard about it at the end of PoA, but I 
> don't think he believed it. 

Goddlefrood:

The relevant canon is in:

http://groups.yahoo.com/group/HPforGrownups/message/169043

Severus certainly overheard the conversation about the 
Marauders learning to transform from the lips of two of 
them in The Shrieking Shack. It's possible he didn't 
believe it, but it's also possible he did and actually 
kept his mouth shut for his own nefarious purposes.