My little old shar-pei that I sadly had to have put to sleep a couple of months ago used to go bananas over spiders. She wouldn't rest if she'd seen a spider until it was caught and eaten. Half and hour of skittering round on the vinyl floor, punctuated by the poor spider finding temporary refuge and her growling and barking manically at the exact pitch that sets every nerve in your body jangling is not the most soothing aspect of dog ownership.