My dogs never indicated that they picked up the scent of the first furry critter I saw, or the 2 muskrats (I saw them for only a split second as the dove into the pond, so maybe they weren't muskrats). If they knew there were critters hanging around the pond, they would probably hunt for them, but I don't want my dogs tangling with an otter in deep water, and I'm sure my Airedale would go after one if she saw it in the water.