The law in plain English
Return deadline
Under Mo. Stat. Section 535.300, the deposit response usually has to be sent within 30 days of the move-out timeline described by the state rule.
Required notice
Missouri generally requires an itemized list of deductions and any remaining deposit within 30 days after the tenancy ends.
This dispute type
Pet-related deposit disputes usually turn on proof. In Missouri, landlords still need to handle the refund and deduction notice correctly, and renters usually ask whether the charge reflects actual damage or just the landlord's assumption that pets always create extra cost.
Penalty leverage
If the withholding was wrongful or in bad faith, the exposure allowed under the statute is: You can recover up to twice the amount wrongfully withheld