My dog likes regular tennis balls and won’t give Kong ones the time of day. I liked that these were designed for dogs and had pet-safe components.
I bought a 3 pack and unfortunately my dog has destroyed 2 of these balls, each in about 10 minutes. His teeth puncture the surface and he easily chomps the two halves of the ball apart. He’s a pit shepherd mix (55 lbs) and loves to treat tennis balls like prey. If that sounds like your dog, these might not be a good fit.