Rat Problem with tenant

[Varinder Kumar]

I recently have a rat issue at my SFR. The rats are coming in from the roof. I called a rat exterminator and he said there are 3 openings on the roof which they are entering from. He set traps in the attic and said he would check in a couple days to see if the rats were eating the bait. Today i get a text from my tenant telling me that the rats ate through his harness cable on his motor cycle. I believe my tenant stores his motorcycle in the back yard. The rat exterminator also told me that there is alot of dog poop on the side yard of the house, where my tenant keeps one of his dogs, the rat exterminator said that dog poop attracts rats also. I did have a chance to talk to my tenant about that yet either. However i feel my tenant wants to hold me responsible for the cables on his motorcycle. I dont know how to respond to his text and whats the beset way to proceed?? Please advise, thank you.