Any tips on stopping my cat pooping in neighbours garden?

[LMST]

Any tips welcome- has anyone tried those electric fences that go round perimeter and send buzz to their collar if they go through?

Have tried-
Keeping indoor litter tray spick and span for him
Put down those citrus cat repellent crystals in her garden
Used about type of cat repellent in her garden

She is a lovely elderly lady who is very proud of her garden. She is very polite about it but I feel bad.

The worst thing is he goes across next door's garden to go specifically into hers!

Any ideas?

Thanks!

The lady can get a device which emits a high pitched noise to repel cats from her garden. Also try to make your garden a good poo place, such as having a patch of loose soil that it can go to.