This is an excellent product that really works. I have a 2 year old Cocker Spaniel that has a very loud bark and he barks about everything. Nothing else I tried with him worked. I ordered the product and then kept it near me knowing he'd bark about something soon. Sure enough, he did. I ran over near him and shot off a spritz of the "Sentry Stop That" about two feet away from him. He looked at me with shock and horror and immediately went and got into his bed-I didn't say a word. That first day, I used it 5 or 6 times. The next day, I only used it about 4 times. By the time I'd been using it 5 days, I was only using it once or not at all each day. His barking has dropped 95% ! The can makes a little more of a hiss than a can of hair spray does. The scent is horrible-I try to use it only outside if possible and use the tiniest quick spray I can. I don't know what this stuff is and I hate the smell but it is worth it to not have constant barking all the time. Good Job, SENTRY!!