Unscrews into two halves – Load it, twist it shut, put it on the floor. Treats work their way out as it rolls.
The inside comes out – There's a removable cone in the middle: leave it in to make it harder, take it out to make it easy while your dog is learning.
Splits apart if it's crushed – The maker built the top to come apart in two rather than crack, which is the sort of detail worth knowing on a hollow ball.
Clear body – Your dog can see what's still in there, which is most of why they keep going.
