Looking for condo association rules regulating dangerous pet dogs

I am on the board of our condo association. We allow dogs without a weight limit, but a limit if two dogs. A tenant moved into a unit with two pit bulls. She rescues dangerous dogs and apparently rehabilitated them. One escaped and chased the mailman. We are very worried about this situation as the tenant does not seem to be in control of her animals in the unit and while working the dogs. Is it legal to prohibit specific breeds of dogs, as well as, aggressive dogs in general? If so, where can I find pet language to add to our rules and have reviewed by our attorney? Thanks so much!