The reasons why dogs run around with toys in their mouths and still grunt:

1. Dogs hold toys in their mouths because they want to play with you. If you don’t play with them, they will grunt. , this is a sign of a dog acting coquettishly towards its owner.

2. It may be that the dog does not often play with toys in its mouth, but suddenly becomes very excited when playing with toys in its mouth, so it hums.

3. If the dog runs around with toys in its mouth and moans, it may be that the dog is in heat. During this period, the dog can be bred or neutered.