I put 2 collars on my 2 Chihuahuas for 2 weeks & they never stopped barking. Also the house smelled so strongly from the citronella that it almost drove me out of the house. The collars were working as advertised but my dogs didn't mind the smell. I did call the company to return them but learned their policy is once you open/use a product it can't be returned. Learned a non expensive lesson to check return policies before ordering.