There are tons of different Nylabones.  They last for ages, though their appearance certainly deteriorates significantly before they disappear completely.  According to the Nylabone website, the toys "promote good canine dental hygiene, enhance overall mental fitness, and encourage positive behavior."   We pretty much agree with that.  This is a dog chew bone that our dogs like — especially the original flavor.  Just make sure you have enough Nylabones for everybody — theft is an ugly outgrowth of good taste.