I don't think the zoomies (we call it frapping at our house) is bad behavior but teeth growling and biting definitely are. Any time a dog does this they are challenging you. You need to as quickly as possible get a firm hold of them and flip them onto there backs hold them their strongly with your hand on there chest and say no really low like a growl. Hold them their until there body goes limp-like, this shows they have submitted. Seems mean, but be firm and never rough. You are the pack leader and need to show them at the first signs of aggressive behaviour. You would be amazed how well it works and soon just a low NO is enough and you don't have to flip them over...but for real bites you must "pin" them like a mother dog or pack leader would.
I think frapping or zoomies is adorable though.
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Mary
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