This chewable are amazing, My mix Huskie Malamute, all the sudden has been howling to the extreme,  he walks and run a lot during the day but lately when is bed time he is just not himself like he was before,  he is a big boy so I gave him 4 tables to start and with only one dose he is back to normal, lying down without all the noise, and going to sleep peacefully!!! I was ready to take it him to vet, I thought something was wrong with him but after I reading some of the reviews I decided to give it a try. It makes me happy that he is able to go to bed and be calm again, highly recommend it!