You lost me there for a moment, waterlocke. I'm such a KC fogey that I had to wiki Plummer terrier, though I had guessed it was a working type like, say, a Patterdale is. Well, it will be no great size crossed with a staffy, so the best won't cost you much. Breeders prefer dry food because there's less mess, literally, and a little of it feeds a lot very well, compared to bulky, and moisture laden, tinned food.