citronella is known to repel and you can also get some specific dog/cat repellent called get off my garden (in a spray or pellets but for hard surface you would use a spray) that you could use to repel them.
I think there are repellant sprays you can buy from pet shops, not sure how effective they are though. I used to keep guinea pigs as a child, and nothing I tried could keep the neighbourhood cats away. I once found the neighbour's cat eating one of my guinea pigs. They also used to break into my aviary and kill my birds for fun. Needless to say, I am not fond of cats and I think they should be confined indoors by law.
If you can afford to trap them, that might be a solution. But they're born killers really, the instinct is so strong in them.
There are lots of natural remedies such as
- Citrus fruits - oranges and lemon peels.
-A mixture of eucalyptus oil in water sprayed on the ground once or twice a week
There are lots of sprays on the market, but they will be costly if you need to use all the time.
Motion detector sprinkers! lol.
Just becareful what you use...as you dont want to hurt the little piggy.
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