We used another well known product on 3 different cats who have lived with us over the years, on the advice of our vet. One cat actually sprayed the diffuser and the other 2 cats it did nothing for them. This time we have 2 rescue cats who are on their 4th home. One was highly strung and terrified and the other was marking on curtains and carpets. The vet even had to anaesthetise one of them to check them out before we were given them. We even hired a Pet Psychologist to help them. That helped a bit but we still had problems. Last year our vet recommended and used Pet Remedy in the surgery and what a difference. The cats became more settled and peaceful and we could not believe how good the remedy spray was. The cats were also became stressing out when we went away on holiday. We now use plug ins when we go away and that keeps the cats settled. We have now had these cats for 4 years and because of Pet Remedy they have a better, less stressed life. No more wet curtains!