These pass the tough chewer test!
349754
These pass the tough chewer test!  Both my dogs love these.  I bought one for each of them, but, of course, they only ever want the one the other one has.  They have last a long time so far and they chew on them daily!  The only down side of these bones is that my dogs leave the little plastic "shavings" all over the spot where they are chewing.  This is something I can overlook if they continue to keep my pups occupied and happy!
4807244
My dogs are really big chewers and these balls are holding up great!
988819
We have a 10 month old hound/lab/spaniel mix(50 lbs) who is the most destructive chewer I have ever met.  I was beginning to think that he was doomed to a life of only having nylabones and classic kongs to play with, but the Chuckit ball also seems to be a winner!  We've had them for 3 days now and they have stood up to hours of chewing that is intended to be destructive.  I am very pleased with these balls and will order more when (if) they wear out.
1438755
I have labs that are extreme chewers.  Within 2 weeks, one of the four I purchased was almost gone.  Yep...  it was consumed...  Luckily it did not cause blockage...  the other 3 are still in pretty good shape considering the abuse they have gone through.  I allow my labs to continue to chew on them, as they are no longer eating them, and does not seem to pose a threat to their health.
3471376
Our dogs like them a ton, easy to fill and great for heavy chewers!  3 bulldogs have not managed to make a single mark or hole in these!  That is amazing considering they can tear right through tires, bully sticks, any and every toy.  But they do have an awful rubber smell that I find offensive but the dogs don't mind at all!
1486353
Our pup is a tough chewer and these felted wool toys last a long time and curb his need to chew! I am a big fan of these safe toys!
3535794
My dogs love these, and as a bonus, the inside is actually a pair of rubber squeaky balls, so when the fabric DoDo layer gets "killed," they have two "new" squeaky balls to play with. :-)

The medium size is a good fit for my two dogs who are tough chewers that range in size from 50 (the little girl) to 75 pounds (her brother).
1949516
Both of my dogs are EXTREMELY diligent and persistent chewers. Most toys my husband and I have gotten them are destroyed or at least somewhat damaged by the end of the day. I'd be lucky if the toy lasted 2-3 days, tops. These toys are different. They are perfect for my little chewers! It's been at least 2 weeks and they are still in-tact and just like new (except a very slight discoloration from the chewing and the slobber). Best thing is that my guys are always bringing me one of these balls to throw. They really enjoy them. And the price is VERY good considering the durability of this product! A MUST-BUY for anyone that owns a destructive pup :)
3301324
I got these for my 4-month-old puppy to chew. She loves them! Some of the cons are: 1) the size greatly varies, I received some that were small and thin that she chewed up really fast (like in 20 minutes); 2) they're expensive -- I made 12 of them stretch 5 weeks, but I also gave my puppy other things to chew;  3) they are choking hazards -- my pup nearly choked on one that she had nearly finished! So watch your dog closely when they get towards the last curl of these things. Some of the pros: 1) the large ones last for days! My pup cant even finish a whole one after chewing for hours; 2) no smell, no staining; 3) they are beef tendon, so they don't break up into jagged pieces and if large pieces are swallowed, they will come out the other end, which I can attest to.
3848876
My dog absolutely loves these, and they're tough enough that he hasn't destroyed them yet. They've survived 6 months where most average dog toys and even some "super durable" and "tear resistant" toys barely made it a week.
528169
My three dogs are tough chewers and a month later these toys are still relatively in tact. Its not for lack of trying, they LOVE, their wubbas and carry them everywhere. Perfect toy for hardcore chewers.
712999
Great for tough chewers and safe too. We buy these all the time.
4549741
My dog goes ape sh*t over these.
I have purchased about 20 of these over the last 3 years.
They hold up well, but my 3 year old Akita will play with them literally non stop until there is nothing left.
A++!
1120805
My three dogs love these Mini Bones! I'm taking off one star because I had hoped they would be "tougher" and  occupy more of my dogs' time , especially that of my destructive "chewer." Unfortunately, he manages to devour these within about three minutes, but that's three minutes that I don't have to worry about him destroying a sofa cushion or a shoe that a family member made the mistake of leaving within his reach!  sI will purchase these again.
1386995
These chew toys are awesome! Sturdy, well made, and our puppies took an instant liking to them! Chewed and played tug of was with them until we put them away.  Such a great value!
3625825
We have three large dogs, a pit, lab, and a dane mix and they tear through chewables like they are nothing.  Two of my boys can break bully sticks in half so that's how much power they have behind their jaws.  These nylabones are simply the best things that we can find for them to chew on.  I usually have 4 of them at a time (hence the four identical reviews) and it takes the boys about 6 months of working them over before we have to replace them.  Nothing I have tried comes close to being this tough except maybe the extreme kongs but they don't find them near as interesting to play with.  The shapes all seem to be about the same, some days they prefer one, some days the other, but all get chewed on regularly.  Definitely recommend if you need something to occupy some serious chewers!
3678363
My ferocious chewers love them. They are not too soft, do not seem to splinter, do not smell bad at all  and so far no stomach upsets. I reserve the right to post any problems  later but I don't forsee any.