My sister installed a noise maker to ward off animals from pooping on her lawn.
Is it working as it should?
Yes, the animals have stayed away.
Having animals in your yard can be very annoying. Keeping your lawn clean can be tough sometimes, I'm glad she found a way to combat the animals.
It's a little cruel though, I feel bad for the animals.
I don't think it's cruel. I think it's actually a good solution that doesn't result in the animal being hurt. Isn't sacring them away better than shooting or poisoning them?