Had 2 cats who overgroomed for years. Tried all the stress remedies, the plugs, tablets etc. We experimented with foods and even had skin biopsies done which proved that that there was no allergens present. Finally we went down the monthly steroid injections, which didn't make the problem any worse but wasn't a miracle cure either. Unfortunately we had to reconsider this when one cat developed diabetes. We tried both Allerderm on one and Dermoscent on the other and within a fortnight hair was growing back. Have been using now for 6 months or so and can honestly say both cats have furry tummies and furry front and back legs. The diabetes went into remission and I now have two healthy cats with beautiful coats. Hoping now that they do not develop a resistance to the product but fingers crossed... Incidently, we narrowed down the problem to Leylandii Cypress trees when we moved from a house with a tree in the neighbours garden to a row of them in our new garden. Unfortunately neighbours also have them both sides so can't simply remove them.