Are the small 'prey-dogs' also running free and what does she actually do when she catches (up with) one ?
I saw my girl start playing with a very small, fluffy little black dog at the dog park one day. They seemed like they were just playing, doodle would chase, the fluffball would roll over. Repeatedly. But then I noticed that doodle put her mouth over the dogs neck. I watched them, carefully. The two would play when they saw eachother without any animosity. They seemed like pals, despite the fluffball's dimunitive size. Then one day after the fluffball had flipped over onto it's back and doodle had her neck in her mouth, I noticed doodle start to move her head from side to side. I was horrified. I realized that one quick jerk and that little fluffball would be dead. The thought still rattles me.
doodle's personality indicates that she would never intentally hurt another dog. But the fluffball probably weighs as much as a squirrel. And doodle's instinctive prey drive was literally a moment away from something that couldn't have been undone.
I've talked to fluffball's owner and explained my concerns. Fluffball should be allowed to run and play at the park the same as any other dog. But I can't bear the thought that doodle could hurt it, so... from that moment on, when I see this pup come in the gate, we politely leave.
p.s. It didn't help that this dog sounded like a squeek toy.