I am always looking for dog toys that'll keep both a very large Great Pyrenees and a pretty small Cavalier King Charles happy. The Starmark Everlasting Groovy Ball is a winner!
The Groovy Ball is a big rubber chew with ridges to work your dogs gums. It has several holes that snugly fit the Everlasting treats. Dogs find the variety of treats delicious and work at the ball until its gone. Everlasting means 1-2 hours if your dog isn't a able to pop the treats out. Nemo, my Great Pyr, can remove the treat with ease while Pretzel the Cavalier enjoys a really long chew.
Most importantly the Groovy ball, as are all the similar Starmark toys, is quiet. This is a go to treat when I need to focus.