My vet highly recommended this product to help one of my cats, Ebony, with her recurrent attacks of cystitits, possibly caused by stress. She has had several tests and there does not appear to be any specific cause. I have two cats; they are sisters and have lived together all their lives (about twelve years) with no problems. The cystitis flare-ups, when they come, are distressing for both of us but luckily urgent treatment has an immediate effect. I was sceptical about this product at first but purchased two diffusers, one for the bedroom and one for the living/dining area. There is a not unpleasant ‘earthy’ smell when they are first plugged in but this soon fades and is only noticeable on walking past one. I have been using them for just over a year and have noticed that the cystitis attacks are becoming less and less frequent. I will certainly carry on with the Pet Remedy as both cats are happy and contented. I would recommend anyone with a similar pet problem to give this a go.