I have noticed that the average chicken trusts a dog better than they trust a cat. They are much more wary of cats. I believe it is because dogs have been used to guard livestock for hundreds of years, while cats are not bred for that due to their sport-killing behavior.I would trust cats ~ even the loose ferals around my hens before any dog (& I love dogs). I have a respect for dogs' possible sudden boisterousness where they possibly think a mad hen is great fun to engage with. I've seen cats smart enough to back off from a mad hen rather than engage in battle.