High value reward, if your dog tolerates vegetable glycerin well.
High-value reward for the dog, especially for the duration behaviours. It's semi-moist, chewy, takes time to eat, they smell meaty, and my dogs love them.
Note that they taste sweet due to the addition of vegetable glycerin.
Not all dogs tolerate vegetable glycerin well. One of mine has no issues with it, another develops diarrhea every time. The evidence on the actual impact of glycerin is unclear (you won't really see it in human food that often; mostly in soap...), so do your own research.