Are off leash dogs allowed in parks?

I live near a big park and there is a person with their off leash dog multiple times each day. This dog is off leash running around a children’s playground. I like dogs, I have two but I also know other people may not like them and there are reactive dogs who would absolutely get triggered.

I can’t find if this is against bylaw, I’ve only found the city page on barking. If it’s not against bylaw, then I’ll need to walk my dogs somewhere else. If it is, where can they be reported?