I got Sadie as a companion for Rowdy and an exercise toy for Marble. She was a stray dog with a few minor medical problems. She integrated into my household right away. She has no trouble keeping a 100# Rottweiler in line (although he is pretty tolerant) and she harasses the cat enough to get him to chase her once in a while. She is happiest when she can run and run and run. I rent her out to tire the neighborhood dogs.