I've got a tom who has always been very nervous, he's been on tranquilisers for it in the past and Feliway didn't solve his spraying problems. However, it did work on our other cats who don't have such severe stress problems. We used it when we were moving or on holiday. You can get the smaller sprays that are quite cheap just to try it. I think it depends very much on the cat.

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Mummy to 1 puppy, 3 cats, 3 chickens, 2 guinea pigs and 2 small children