I am not sure how others found this product helpful. It is no more effective than water.I have Old English Sheepdog males who fight. I keep them separated at all times. Occasionally someone accidently leaves the gate open and the fight begins.This product doesn't deter, it does NOTHING! I too used several cans with no response at all.If anyone knows of a product that does work, please let me know.Please don't rely on this one!!!I wouldn't give any stars if it were possible.