Short review: 4 dogs, of all ages and sizes but low-medium chewers - very enjoyed and strongly recommended. Would be cautious with an enthusiastic/indiscriminate chewer. Very quiet for humans, dogs can clearly hear it.
Long review:
We are a four dog household. Our youngest dog is 9 months old (70 lb Farm Collie) and our oldest is 16 years (8 lb chihuahua). Also in residence, a 13 year old Schipperke and a 6 year old Rat Terrier. All the dogs are very curious about this toy, but it is a huge favorite of the Rat Terrier and Collie. I am so glad we got it (we got one of each of the toys). Our boys chew antlers like crazy but will play nice with stuffed toys. They also have other rubber toys that they chew on, but aren't bent on their destruction by any means. This toy has been in play for a few weeks now and has teeth marks from being chomped down on. There are no signs of tearing/serious wear. The dogs will play keep away with each other, but mostly they play with the toy solo- batting it around, mouthing it and giving it a shake and a toss. If I saw one of them settling in just to chew on it, I would take it and replace it with a true chew toy. If the 70 lb puppy had a mind to wreck the toy, I think he could - but he is a true medium-light chewer.
For me, the best thing about this toy, was seeing my old man Schipperke come over to have some fun with the toy. He used to be a real varmint hunter in his day and hearing the toy perked him right up. He doesn't play with it too often, but when he has the energy it really captures his joyful attention and it is like seeing him in his youth again. This has given me some really unexpected but very treasured moments with my senior buddy.
My husband has hearing loss from military service and cannot hear all the sounds that the toy makes. I can hear them, but they are easy to tune out. All 4 of the dogs can clearly hear the toy, which again, I was surprised since I think the 13 and 16 year old are losing their hearing.
I am very happy with this toy and have recommended the brand to some other friends. As we are all on zoom meetings, the quiet squeaker that still entertains dogs has been a great compromise.