Well Ontario is a stickler like some states in the USA, who banned "bad dogs" and not "bad owners"
Domesticated rats are.. not wild rats.... lol Pest rats, can grow to enormous means, and carry diseases such as rabies, HIVs, and many others that HAVE caused plagues in the past, but domesticated animals of any sorts have been bred, and well kept to ensure health (or should ensure health). But yeah... I understand their thinking - to a point. Rats = bad! But... all domesticated animals including snakes cannot live in the wild let alone ALBERTA
most of the animals have never seen snow, or had to forage. I've seen King snakes, cornsnakes and a few others slithering around, but I know they USED to be pets. They last until winter then die. -.-