I live near a wide open area which has a lot of wildlife. Foxes are the main concern due to them carrying a lot of fleas. We get a lot of fleas in the house, especially summer time - we actually think we've got them again. I've been out today to get some more Frontline for my 2 cats just as a precaution. Is there absolutely anything I can do to prevent my cats from going over in to the open area the back? I was thinking like a high pitched noise which would prevent my cats from going anywhere close to it, and consequently prevent them from entering the think under-growth at the back.

Does anybody know of any products like this?

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