We have tried a few other deterrents. This one works very well. I don't think anything is 100%, but this one definitely curtailed the activity better than all others. Along with picking up A.S.A.P. I give a little bit more by rounding out slightly the little 1/2 tsp. scoop I use for a 20lb mini aussie ( I have never given a full tsp.) . No adverse issues like loose stool or vomiting ever. My Vet stated there have been no adverse effects re: MSG that he is aware of. A couple of products we tried previously, I obtained from PetCareRX, did nothing at all to deter. But I don't like PetCareRX anymore anyway. They are no longer managed by nice people. Countryside is where people work who love furry kids and they want to actually help you. Give For-bid a try