Can anyone tell me if it's illegal to leave a dog outside all day? There is a small dog that lives across the street from my parents in Chicago and this dog is basically kept outside most of the time with no shelter, only wears a sweater.

Call animal welfare..they will show up as nd investigate

What kind of dog is it.and is it small.

Absolutely.

only if the weather is extremely cold, farm animals are outside all day

It is animal abuse to leave an animal outside all day w/no shelter from the elements. Report them. Call 311.

I believe so yes. It's abuse. Call right away!