
Mine still does it now - especially in really long grass. He likes to add a game of chicken in with it too - stand still and he will miss you but move at your peril

He only took me out once and then I learned to trust thaht he would miss me but you can feel his hair brushing your leg as he passes.
The bum tuck zoomies make me smile every time. When he was about 8 months old I took him to a one off outdoor recall training class to just brush up on his recall with distractions. The trainer was rather "odd" and also didn't really like big dogs - the others were all small dogs but I thought it was worth staying to see how we got on. It had rained all day and was surprised that the class was still on as there were huge lakes of standing water on the field. We spent the first half hour just watching all the small dogs doing their bit and Harley and I just stood watching. We finally got a turn at a recall right at the end of the class - I rather suspected that if I hadn't asked when it would be our turn that we may well have been "forgotten".
We were then set up to fail

All the other dogs did recalls from 20 odd feet away - ours was about 50 yards. Harley did an amazing wait but when I released him his pent up energy and patient waiting got the better of him. He took off at great speed, bum down head up and literally hurtled towards me. I suddenly realised he was going so fast that I couldn't see how he would stop in time. I literally shouted STOP to him and he did his very best to do his emergency sit but aquaplaned on a puddle and ploughed through the mud and water in a semi sit position but crashed into my knees. I fell flat on my back into a puddle and he thought we were playing a game and leaped on top of me. My daughter was in fits of laughter and totally unable to come to my rescue - I was crying with laughter, soaked to the skin and had liquid mud forced through the neck of my coat and right down my back. Every time I tried to get up a very large, happy, wet, muddy dog leaped on me again. I eventually managed to stop laughing and get him off me - he had a huge Golden grin on his face.
The trainer and other dog owners looked horrified - which made me start laughing again as it's almost impossible to be serious when one resembles the creature from the black lagoon. She came up to me and said that she didn't think we were suited to the class and to please not return the next week.
I had already decided I wasn't going to return after the first ten minutes of the lesson but did say to her that he surely had earnt some points for enthusiasm. She wasn't amused.