The Sentry collars seem to work the best for Charle Brown. The other brand did not work and yet it had more of the calming ingredients in it! He has slowed way down chasing our kitty Natasha compared to when he wore the other collar.
Still chases her sometimes, BUT, the Sentry collar has helped that he does it much less.
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Review 7 for SENTRY Calming Collar for Cats (3 pack)
A helpful product....
Date:September 4, 2013
Breed:Orange and white male tabby and Corgi
My neighbor suggested these for my 8 year old wonderfully laid back, medium haired orange and white tabby after he went through the loss of his long time buddy, our 10 year old lab mix. He mourned Mickey and began marking. She suggested I try these collars along with the plug in diffusers. They definitely helped him adjust to the loss, and also to bringing home a new puppy several months later.