Jilly the thing with leases that other tenants and no pet clauses is that a LL can choose to let one tenant have a dog and deny others the same ability just like cigarette smoking there are some landlords who have allowed older smoking tenants to stay on but newer tenants leases don't allow smoking. As to any further communications with the actual landlord use letters written on real paper sent via certificate of mailing or confirmed mail delivery ( those are the two lowest cost means to give you a receipt showing to whom mail was sent , staple receipt to your copy of the letters and save as if you were going to need it for court so you will have a paper trail proving you have complained about it.