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Is there a way to join my dog's dreams as Player 2 so I can help her fight whatever she's growling at without waking her? - (No surgery or unsavory magicks)
A lot of that growling is likely playful. You'd just become the dog's fetch slut or tug bitch. You can usually tell based on pitch. The sort of growl heard during play is just the dog version of a kid laughing.