Leash Aggression
 

Hi, today Yogi started to become very aggressive on the leash. Up until now he has just come up to strangers on walks and sniffed them but today he growled at 3 people and actually bit 2 of them on the jacket with the front of his mouth. I have just signed him up for obedience classes at the MSPCA but I am currently awaiting on their response to whether or not he will be accepted or if the date i chose is OK. What should i do about walking him until then? I bought a prong collar just in case something like this happened but i haven't used it. Should i start using it until we get to the class or just take him out to use the bathroom only until the classes start?

How old is Yogi so I know where to move this thread to?

Lisl saw half a dozen people today on our walk and only growled quietly at one of them for a second. I was proud of her.

He is 5 months old

The MSPCA told me not to bring him to the first class, so he will not be getting any obedience training for a week. Does anyone have any advice on walking him/ preventing this behavior until then?