ats by Zukes, but they seem to be harder and are too big to offer a small dog as a treat, yet too difficult to split into smaller pieces. So, I find the square shaped ones to be much easier to use for training.<br /><br />They CAN get hard if the bag is left open so you need to make sure to close the bag immediately. I read another poster mention that putting a damp paper towel in the bag will restore the moisture to the treats, so I'll have to try that if I forget to close a bag, which happens.