Dog loves it but they get hard pretty quickly
342117
I cut these into two pieces and use them as treats. When they are cut in two they leave a lot of crumbs, so a smaller version of these treats would be better for smaller dogs so that we don't have to deal with the crumbs. I leave the ones that I plan to use in the ziplock inside the treat bag but they get hard after a couple of days. When they are hard I am afraid to give them to my puppy, because he doesn't chew much, he just swallows it as is. I also put the package inside the ziplock and those ones have been staying fresh and soft, probably because I don't repeatedly open and close it like I do the treat bag.
2048777
Dogs love it,  but do get tired of it after a couple meals,  wish it was a little cheaper though
2426355
The toy itself is an appealing color and is pretty heavy.  I have a strong, energetic thirty pound American Bulldog & Beagle mix.  It is cute to watch my dog carry and handle the toy.  We were looking for something tough for our smart chewer.  The first one last a while but my dog has learned to use his front teeth to nibble the fabric away from the seam line around the donut.  Once he pulls up the fabric he then proceeds to gnaw a hole because he wants to get the squeeky sound mechanism out.  He can only enjoy it for a few minutes at a time before he wants to gnaw/chew and I then have to remove the tough from him.  A great product for a dog who will play with it vice become prone to want to chew the toy.
3057818
Dog loves it and it won't drive you crazy with squeeks all day long.
However, this is definitely not a durable, chew-resistant toy. So , if your dog is a vigorous chewer, I would say clear.
4156976
My shepherd/malinois loves these bones! The last one lasted him quiet a while but he's only 9 months old and he had it since he was born. We decided to get him another one and minutes after giving it to him it had cracks in the middle. It's been a few days and it's still holding up but I can't imagine it's going to last him to long. I rated it 3 out of 5 stars because he likes it so much and we don't even put treats in it. He just chews on it plain. Also it is labeled for average chewers. I'm sure it works just fine for dogs who have less powerful jaws. I'm going to try the extreme version (black). Hopefully that one will hold up better.
710209
My dogs really like them, they are tougher then the vynal squeakies, but they can still be easily chewed up.  I just don't let them keep the toys after we play ball but they really enjoy them.
1170694
My dog loves this ball.  Had to buy a second one because the first one lost its squeak in a week or so.  Now the second one has too.  Only had them for a few weeks.  But the dog still loves chasing them around.  The texture is easy for him to grip.  But not worth it if you must have the annoying squeak.
2829656
This is a great product, at least for a 20lb Westie. He's very strong and can be an aggressive chewer and has destroyed many other products but this product appears to withstand him for now. It's not an expensive toy so I do not expect it to last forever like this and am happy to buy new ones periodically. Moreover, I find the complaints about struggling to get the treat into the toy curious.  I feel like quoting a family member who once said "you have to be smarter than the toy". Is it effortless to get the treat in? Of course not, that's the way it should be lest it would be effortless to get the treat out and therefore render the toy useless. But it is hardly that difficult. Basically you can easily get 75% of the treat into the toy and have to twist it a bit to get the rubber, or whatever the material is, over the ridge at the bottom of the treat to secure it. Seriously, not that hard.
1592523
My dog loves them. I on the other hand, found them a bit hard to chew.
2549828
My dog likes it a lot and will play for ages, but the hard plastic is tough on his teeth. Throwing away and replacing with a more tooth-friendly option for my chew-happy pup.
2400496
it works pretty well and keeps my dog occupied.  i like that you can change the outlet inside the ball for different sized treats or for more difficult playtime.  Only complaint is that the material is slightly less durable than I'd like.  My dog is an aggressive chewer and chipped off a few pieces of the plastic lip (product still works though).  He does love playing with it once he remembers he has to roll it and not just chew through it.
4211686
Within 30 seconds, my dog, who has very powerful jaws, got through to the stuffing.  He does this with every soft toy we give him, but I'd hoped that this one would last longer because my parents' dog took longer to destroy hers.
865096
Great toy for hard chewers! My 2 corgis love it and will chew on it for hours! However, if they are very hard chewers this toy will start to splinter so you have to keep an eye on it so you know when it's time to buy a new one. Otherwise you will end up with plastic splinters all over your place and of course it can be dangerous if they swallow them.

Also as a side note if they are chewing on it on you for a while like my two do, it can get a little sharp and kinda hurts when they poke you with it....
2198194
I have this toy in a few sizes and colors. It's not my dog's favorite toy but when I smear a teaspoon of peanut butter or cream cheese in it, he loves it to pieces.

He is a very aggressive chewer and the Kongs hold up to his King Kong jaws but I don't think he's a big hard rubber fan. He likes soft things that squeak when bitten...like my toes. ;) Still, the Kong is a good distraction while the humans eat dinner or when he has to sit in his crate or in the car.

I definitely recommend stuffing it with something to hold the appeal for finicky pups.
2541353
This toy is hard and heavy and my dog loves it. He has a habit of obliterating all toys in his path. We got the triceratops and he's barely made a dent on the head or tail. It's been a huge help to get through teething.
404312
My dog loves these bones! but she goes through them pretty quick. if they were a little more durable, they'd get five starts. little dog LOVES them that much.
1321550
I have a husky/shepherd mix that gets bored during the day and I was looking for something to keep her entertained and thinking. She uses it and get the kibble treats out but she seems to get bored with it after a few minutes. She doesn't return to playing with it much and prefers her stuffed kong which she will work very hard to get the treats out. She'll be working very hard to get her food for nearly 90 minutes. When she plays with it she's pretty aggressive and the toy has held up to each strong jaws and teeth. She is an extreme aggressive chewer and has gone through a reasonable beef bone marrow in short order. So this ball can hold up to the most aggressive chewer. It also hasn't opened up as has been mentioned in other reviews. Nothing wrong with the IQ treat ball it's up to each individual dog whether he/she will enjoy it. I adopted my girl 2.5 months ago and am still learning what she likes and doesn't like. As a dog parent and you know your dog's likes and dislikes than you would be the best judge if this would work for your pet. If my dog would've loved it it definitely would've gotten 5 stars.

Update on 6/6/2018: Okay, so my sweet dog has proven me wrong and is now more interested in playing with it and works to get her treats. My dog, in my humble opinion, a pretty bright girl so it's interesting that it has had kibbles in it for over a week and she now enjoys playing with it. It's like a bulb went off and she realized what to do.  So as I had previously stated that if my dog loved playing with it I would've given it 5 stars I'm going to keep my word and update the ratings to 5.