I gave one of these to my boy - an 8 month old terrier type dog. Right size chew for his breed and weight. Supervised him with it. He was chewing away happily and then suddenly started to choke. He was running around in fear so I couldn't get to him and obviously as he became weaker and more frightened I managed to catch him. Got into his mouth and a third of the chew was completely wedged into his windpipe, I couldn't even see it but could feel it. I managed to get a finger down the side and got it out and he's ok now - shaky and quiet but ok. I think the shape is dangerous and while it is made of a spongy type substance and has holes running through it for just such an eventuality I imagine, the holes were actually totally compressed by the wall of his windpipe and no air could get through.
Please don't use these. I nearly lost my dog today. I'd never usually give him such chews but someone bought it for him and I didn't see the harm.
Just wanted to let people know.