In relation to pets, that is not correct mini and is established law. If an owner is keeping a pet in compliance with the prevailing by-law the OC cannot then pass a a by – law preventing them from keeping the pet. If you come into a scheme relying on the basis of pets being allowed, the OC can’t change that so that you have to remove that pet.
However if the pet dies you would not be able to bring another one in.
I don’t believe an OC can mandate the tradespeople residents can use, i.e they must use a particular one.