I want to reiterate that I'm surprised that parents give their children animal toys to chew on. These toys don't have the same rigorous testing that products designed for people have to go through. Also, there are so many options to choose from in terms of chewing items no one should have to resort to an animal chew toy.
So to help you choose a chewy for your aggressive chewers here is a brief intro to Chewy Tubes and more...
The Chewy Tube, designed by speech pathologists, different colors represent different diameters of the chewy tube. Yellow is the thinnest and blue is the thickets tube. P's & Q's are their cheap chewy. They are latex free, non-toxic, and my son loved them.
The Grabber XT is one tough chewy. They are a lifesaver for aggressive chewers. The rounded handle makes it easy to hold. They also have textured Grabbers and regular grabbers, and they are a little bit cheaper than a chewy tube.
There is a new kid on the block called Chew Stixx. So far I haven't heard anything positive or negative about them, but they look very interesting. Because my son isn't chewing like he use to, thanks to Sensory Integration therapy, I can't give you any personal feedback. If you use them, let me know what you think!
The ChewEasy Chewy Tube. This is cool, its a chewy tube attached to a coil cord with a clip. So its easy to clip on and keep track of. A nice idea for kids who tend to loose things.
Exercise Tubing or Refrigerator Tubing, this is what therapists suggested kids chew on all the time. Now w/ the phthalates concern and latex concerns it's not considered a good option. Also, they were not designed for chewing and may or may not meet FDA guidelines.
Chewy Pencil Toppers: These fit over the end of a pencil so a child can chew while sitting in class. They are sturdy, but not reusable in that once the top goes on a pencil it stays there so you can't transfer them to another pencil. However, because they are clear they are a little less noticeable.
Now there are also chew toys, most of these you can get at K-Mart, Toys R Us, or Target:
The Hand and Foot teether: you can find these in almost any store. They are easy to hold and durable.
Knobby Teether Ball: Easy to hold with lots of knobs to chew on. It also works great as a fidget. So you get more bang for the buck.
Razbaby Razberry Teether: This is a teether not a pacifier they are sturdy and have interesting textures and they are silicon based.
The Massaging Action Teether: Great for chewing and it provides vibration for lots of oral stimulation.
Play & Grow Flutterbug: I saw this at Kohl's and it's awesome, lots of textures and it vibrates as well. It looks great for younger kids.
Anyhow I could go on and on and on! My point is there are lots of safe options out there now. I didn't even go into chewable jewelry ... I hope this helps you make a good choice for your child. If you need to buy some chewy items I hope you will visit our Autism Shop!