Answer #1

Depending on their age, they could be teething. When they are puppies and their teeth are just coming in, it hurts so they chew on things to help

Answer #2

teething or they find it fun

Answer #3

hobby , old habits die hard

Answer #4

Full grown dogs, because they are bored I think. Same as digging.

Answer #5

Teething when yhtey are young, its painful just like for a human child so they chew or naw on something to make it better and help. Other times they are bored and find it amusing.

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