I've belonged to PETA, World Wildlife Fund, and I have volunteered at shelters, etc... My life has always had an animal in it and I love animals. That was until my husband brought home a pug puppy. For a year I was tortured by my guilt over my extreme dislike of this dog. She bit, she chewed (going to happen with puppies - I know - but it was INSANE), she scratched, she jumped, she made messes, she started to use my toddlers as chew toys and no matter what we did, who trained her, where we took her - she wasn't getting it. She has been crate trained from the beginning and she still wasn't getting the fact that she had to "go" outside. I don't mean an accident every once in a while, I mean - our living room was her backyard. I was a mess, I was irritable and frustrated with her 90% of the time because (mainly)of her biting. I've trained numerous dogs before and she wasn't getting it. Buying this collar was a last resort and the BEST THING I DID. She had the collar on 2 days and she got it. She got it all. Everything we tried to train her for a year sunk in on the first shock. (And we had the level at a 2!) The kids now play with her, I enjoy my time with her, she enjoys life because she is with us, my older (geriatric) dog is enjoying life because he's not her chew toy. It's AWESOME. The fact that it's rechargable is a plus and the only reason it didn't get a perfect, 5-star grade is because I wish the charge lasted longer. Saved our life, took away the guilt, my kids love her now(they were scared to death of her before), my husband is happy and it brought peace to our house.(And a house with 2 adults, 2 toddlers, 2 cats, 2 dogs and 3 birds needs as much calmness as possible:)) (Our cats are happier, too, because she's not chewing on them either!) HIGHLY recommend it and anyone who says it's inhumane hasn't seen it in action like I did. She does not wear it now except as a re-training every 2 weeks or so. I used to have to chase her all over the house to get her into her crate. My husband used this horrible, high pitch baby voice to get her in the crate (if you had heard that you would have fainted!). One week with the collar and training - and all I have to do is point to the crate and say, "Chloe - crate!" and she's in. It's crazy!