Dogs work as long as they have some size to them. You can also try stringing heavy test fishing line around the pond like two feet off the ground. Also if they just up and fall over dead cause a darned high speed piece of metal just happened to hit them it's not a bad thing either. Just be sure that in the event of a random act of fateful smiting nobody witnesses the happening.
Beat 162 posts in less than 20 minutes and it's yours:
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I guess I'm an idealistic, pseudo hippie, squirrel kicking person. -Billy