With soup bones they are both always in my sight, but for some reason he swallows big chunks/or doesn't chew completely even though I'm watching and then will throw them back up later on Rawhides I've found seem to go through his system a lot better.
I've also tried dried sting ray tails My RR turned away at them but my pointer LOVES them and they literally keep her busy for 3+ hours w/out even making a dent. They are pretty tough.
Haven't tried antlers only b/c they are so expensive and seem so very small in the stores.
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