"My dog is a very active chewer, but can be very picky about what she chews on. Nylabone products are a staple in my house. However, we had a hard time finding the right chew for Darby, our St. Bernard mix. The toys for average chewers would be gobbled up within an hour, but the toys for strong chewers were too hard and she showed little interest. I brought the nylabone ring home, thinking she would like the shape, and she loves it. I usually have to give it to her; she doesn't seem to pick it up on her own. Once she has it, though, it is good for an hour of chewing!
I also highly recommend the Nylabone Dental chews. They are harder than the flexible line of toys, but softer than the durables."