The dog barks.

[just another ref]

Originally Posted by BillyMac

Good point. Does the barking dog (player), or the whistle for the barking dog (player), cause the ball to become dead?

NFHS 6-7: The ball becomes dead, or remains dead, when:
ART. 5 An official’s whistle is blown.
ART. 7 A foul, other than player- or team-control, occurs.

If one rules that the barking dog action is unsporting conduct, this would be the foul. When the foul, such as it is, takes place, the ball is dead, not when the whistle blows.