I suppose we have had the infestation for quite a while, but having a dog, and a terrier as well, has revealed that our garden looks to be a rat run.
Not on the surface though. With the garden decked over for the most part we have provided them with a relatively dry runway across the garden.
Reggie started to dig in the garden and uncovered a tunnel in the earth, Every time he goes out he is running around, sniffing the cracks in the deck and "following" the scent trail we suppose.
So today I am waiting in for the pest control man to come and have a look and set some bait or whatever to kill them, or at least dissuade them from using my garden.
As for Reggie. He's relaxing on the couch.