I bought this randomly one day not realizing how much of a God send it would be in our house.  We have two larger size dogs that have found ways to make most indestructable toys into destructable toys!  We use to give our first dog kongs filled with either treats or peanut butter in her kennel while we were gone.  She was always approrpiate with it till one day she learned she could chew up the kong.  Now anytime we give her one, she destroys it in a matter of a few minutes.  We don't give them to her anymore.  We haven't tried leaving this hurley in her kennel, but all I can say is that my 2 dogs will play with it at the same time and will eventually take turns to sit there and chomp away on it for awhile.  By this time I'm normally in the other room and as I'm listening I will hear a sound as if half of it has been bitten off.  I go in to inspect it and it's perfectly fine.  There are a few teeth marks on it, which is expected with having 2 dogs play with it for about a year now.  But I'm sooooo impressed with it!  I'd love to see how they'd do with it in their kennels, but I'll be patient and work with them a little at a time!  Thanks again for making this toy!  It's unbelievable!!!