Pet owner tenant/landlord rights
Is it legal for a landlord to give a tenant who no longer has a lease, but is on a month to month an amended lease agreement stating there will now be a charge of $100.00 per month for anyone with pet/pets? No charge or penalty was ever listed in the original lease. Does he not have to give more that 15 days notice of this change if it is legal?
Thank you

refuses security refund
I lived in my apt for one year with a one year lease. After that in Feb it became month to month. On MArch 6th we told my landlord we were moving. In my lease it did say 60 days notice but she told us that as long as she rented the place by the end of the month she would give me my security deposit back. Well she insisted we move out by march 30th because she had someone moving in March 31st which they did. Today i got a letter from her stating she is keeping the whole deposit due the house being dirty(fan had dust on it and the oven was supposedly dirty and a few minor things. She even asked for my forwarding address so send the check knowing full well she had no plan on sending it due to breaking my lease. She never lost rent moneyand she refuses to give me back my security. How can i get it back. i live in PA