They die in our house in a couple of hours....! They know just the right spots to kill them. Our dogs love the chuck it balls, orange and blue like rubber tennis balls. They are great in water, they can chew them like bubble gum, no murder needed, we bought 10 balls when they were 5 months old....they are a year now and can still use the same balls. We have replaced soccer balls and rugby balls (they pick them up and they go flat) when they were younger pups....after much painfully irritating training and repeating leave it....we have not had to replace any more balls for other family's since they were 7 months old.
Good luck finding balls your dog can't kill.
Other balls that work....
Jolly ball for horses....tractor supply
Varsity balls....online...but hard and heavy...very entertaining for the dogs.
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