Tenant Move Out Inspection

[Brenton Chung]

Hello,

I'm currently in the process of purchasing my first rental property. As the property is currently occupied by tenants, I was wondering how typical landlords determine what is considered to be reasonable wear and tear in the premises. 

Also, in the event there is damage to the premises that the current owner is not aware of, how do I know what the condition of the property was prior to the tenants moving in or if they are trying to recoup their security deposit by claiming that the damage was there prior to the tenants moving in?

I understand this is a hypothetical situation, but I could see this possibly coming up as the current tenants have a large puppy who may have caused damage in the premises without the current owner knowing. 

Thanks,