Well, this animal can go from docile and friendly to a wild and jumping 45 lb monster within seconds. She can literally knock me off my feet if I am not aware of her actions.
She can leap two to three feet off the ground and can chase a Frisbee that is going AWAY from her and still catch it in midair.
Her very first agility trial, when she was around 1 year old, she jumped the first obstacle and then had a sudden attack of the Zoomies. She orbited the ring at top speed several times, then ran up to the judge, leaped six feet straight up in the air from a dead stop, licked his face without touching any other part of his body, then took off again. The gallery was howling with laughter, which just made her run faster. I finally caught her when she ran out of steam.
She DID go on to get her AX and AXJ, she was running in Masters when I retired her. Didn't get her MACh, she was not fast enough (I nannied her too much when she was learning, so she never ran at top speed, she was always watching me.)
Now that she's 10 and more sedate, the zoomies aren't a problem. My 3 year old Black Lab, Ruby, still gets them, but we've discovered a real problem with our new dog, 10 month old Katy. Ruby and Katy egg each other on, and the Zoomies are far, far worse. They have tipped over the sofa and broken a leg off the butler's table.
Are you clicker training her?