The law in plain English
Return deadline
Under Mont. Code Sections 70-25-101 to 70-25-206, the deposit response usually has to be sent within 30 days of the move-out timeline described by the state rule.
Required notice
Montana generally does not impose a statewide deposit cap, and the landlord usually has 10 days to return the deposit if nothing is withheld or 30 days to send the refund and itemized statement when deductions are claimed.
This dispute type
Pet-related deposit disputes usually turn on proof. In Montana, 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: Landlord forfeits the right to retain any portion of the deposit