Research has shown that dogs find harder and quieter toys less interesting. After all, if they can’t chew into it and it doesn’t even make a peep, what’s the point? They want softer toys that can be more easily manipulated and played with. This is because it's interactive, satisfies their natural chewing habit and keeps their mind active.
When they bite down on a squeaky toy it gives them the pleasant relationship with the toy that they made something happen.
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