I've seen plenty of rats in Toronto. I used to live around Chinatown and I could practically punt a rat just walking out my door at night.

I lived in Chinatown in Toronto (College and Spadina) and I saw a rat the size of a cat running around the inside of a Chinese supermarket around 2am when I was walking around at night during my university years. I also saw smaller rats and roaches running around Chinese restaurants as well.