Well all pattedale pup,s will work , just some better than other,s , my 2 *****,s dont really now , as i had another breakdown a while back , an my wife took to takeing them for there exercise, after takeing them on the local park for a run, the squirrel population when into rapid decline as my 2 dog,s did what they were bred for. Patterdales can jump to great hights for a small dog an grey squirrel,s thinking they made safety 6ft on the truck of tree,s get a rude surprize.Believe this or not but one of my dogs can a does scramble up conifer tree,s.but she is not to cool getting down. They would leave my wife an go on trips an be lost in minutes,they would make there own way home ,or the dog warden would bring them back. So now there strapped to 10ft lead,s when out with her., With me they do as there told. Breeding is a matter of finding a dog you like an its temprement an work record. In england you can find a good breeding dog easy enough. There is a patterdale following in america has hunter,s found out about the reputation an imported breeding stock. The *****s when a big fox or badger goes to ground are sometimes made to wait at the den entrace an you send in the bigger dog, the dog and fox meet face to face underground, so the bigger jawed dog is used . They can an do get head an face injuries , an make no noise when stitched up by the owner,s with fishing line, they are death before dishonour dog,s. ps dyslexic spelling sorry.