I have a Pomeranian puppy who barks up a storm over anything and everything. The collar was really big, but easily solved by cutting off the excess and the product was very easy to use. Unfortunately, once I put it on my dog, he barked once and was sprayed with citronella, but he was not scared at all. He was more curious and continued to bark just to be sprayed. It was quite entertaining but did not serve its purpose.