Quagmire rants on about why he hates Brian and eventually leaves him in tears. He does it in a steakhouse and talks about how boring and bad a dog Brian is. Brian wanted to be his friend after he heard Quagmire hated him.
this is an extract from the speech
" You are the worst person I know. You constantly hit on your best friend's wife. The man pays for your food and rescued you from certain death and this is how you repay him? And to add insult to injury you defacate all over his yard. And you're such a sponge! You pay for nothing. You always say,"Oh, I'll get you later!" but later never comes. And what really bothers me is you pretend you're this... "
***** APOLOGIES FOR THE STILL PICTURE, I UPLOADED THE VIDEO BUT IT GOT REMOVED STRAIGHT AWAY FOR BREAKING COPYRIGHT *****