My dog does well on the subway and buses, but hates the movement / shaking of the jank streetcars.
You get some interesting reactions taking a 'big' black dog on transit though. I've had people bolt out the door to switch cars, people jump up on seats, sometimes a TTC person will be an ass too. "You're responsible for that dog, right?" Mmm, yes, of course? Sometimes I'll pick him up and carry him through a place like Bathurst Station, where it's busy and he is very skitterish on the floors there. That'll get some looks too, but that I understand. 
He likes attention if someone will give it to him, but he's content to just sit there and anxiously await our stop.