I have quite a few dogs (compared to the average house), 5 to be exact. Only 1 of them is a big dog, and she's the sweetest dog ever, she's not my concern. The other 4 are, a miniature schnauzer, a pomeranian, a scottish terrier, and a Bulldog. The dogs are typically in and out as they please. We also have 3 housecats, whom we try to keep IN the house at all times, and the dogs just leave them alone, they never fight. But if I have a few chickens that i'll let run around in the yard, do you guys think the dogs might harm them?