When my dog is scared into crying, the rope in my hands becomes light.

Thus a test that involved pulling strings or operating levers would tend to favor a cat, while a test involving moving from place to place, where speed is a measure of performance, would favor a dog.

There are even bakers that specialize in making dog biscuits and other tasty treats. In addition, some pet-food stores choose to stock other pet-related products, like collars and leashes.