We needed a quick learner; one small enough to fit into the nooks and crannies cats hide in. Mostly, we needed a dog with no desire whatsoever to chase cats
Source: Experience: my dog rescues cats | Life and style | The Guardian
Service dogs, and that they can be so well trained to a specific task, are pretty amazing. I love this one just because it seems so counter-intuitive … and yet it brings real comfort to people.