It is entirely possible for your former landlord to charge you additional money for pet damage when you have already paid the $300 pet fee when you moved in. If you want the return of your secuirty deposit where your former landlord has failed to provide you with receipts and documentation showing the basis for the retention of your $300 pet security deposit within the staututory time, your option would be to file a small claims court for the return of your money.
Your former landlord bears the burden of demonstrating his or her entitlement to the retention of the $300 secuirty deposit for pet damage by photographs, cleaning receipts, witnesses and the like. From what you have written, you seem to have a good chance of prevailing in small claims court. However, I am not the judge who will be hearing the case.
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