How did Sirius Know? - about Cats, Dogs and Rats

[koticzka]

No: HPFGUIDX 57545

Steve wrote:
"I'm of the impression that the Weasley family is well liked and well
known, and I also suspect that 'What house were you in?' ranks near
the top of this list of questions people ask when they meet each 
other."

Koticzka:
Well, especially in Azkaban - one knock - Hufflepuff, two - 
Ravenclaw... ;)

Steve:
"Personally, I don't see Crookshanks and Snuffles/Sirius's 
conversation..."

Koticzka:
I talk to my rat and we undeerstand each other quite well. Perhaps 
not as my dog - Meshuge (RIP). Steve, have you ever had an animal on 
a higher level of evolution that a toad? AND - remember. We are not 
considering pets but FAMILIARS which (who?) need to find Syrius 
wherever he might be to deliver him a letter or are able to steal 
partticular thing from a most appropriate person - like Neville ;)

Even considering muggle animals - some of them are pretty 
inteligent, can save human lives, warn against a fire, recognise 
moods etc. etc....

So one do not need to talk to show the little traitor.
Well, I can imagine a conversation You have mentioned - 
after "Master and Margerita" by Bulhakov one can admit that 
everything is possible.
By the way - no, my rat's name is not Pettigrew one.

More confusing for me is how SB found out about Harry in Azkaban - 
something does not match. And further (is it GOF?) - he kept being 
hungry - no hunting, no stealing (OK, I can understand)?... Does not 
match for me either.

Koticzka
How can you hurt a man who has nothing? 
Give him something broken.