Daisy had the Omega Paw Tricky Treat Ball and absolutely loved it. This fluorescent-orange ball is big and heavy, but not too noisy, and very sturdily made. Problem: Daisy played with it so much that she actually wore the skin off the top of her muzzle from pushing it around with her nose. I had to take it away from her to allow the sore spot to heal.
This past Christmas, I replaced the Omega Paw with the IQ ball. It is noisier than the Omega ball, but it is lightweight, so it does not create friction on her skin. It's also easy to take apart and clean. I let Daisy play with it two or three times a day, putting in about a tablespoon of her daily kibble ration each time. Her muzzle has healed completely. I guess I'm going to have to give away the Omega Paw, even though it's a good toy, because I don't want Daisy to hurt herself again.