I think your guy looks fine, it was mainly just a heads up about the burning calories means he's being very physical and at his point in growth and developing and growing bone it can be a problem. The best development for bone growth is slow growth, the more they burn energy the more you have to feed the more calories to share to the growth and sometimes this can lead to too-fast growth. So better to be too slim while working than keeping him with enough calories to "over-feed" the developing bones. Hope that makes sense. I'm not at all against lots of free movement and exercise. I did hikes with my puppy, we went all over the place and she jumped and crashed and all those things. Made me a nervous wreck but she did fine. I love that you are doing tracking and nose work - mine does AKC scent work and I think it's terrific for exhausting them - not that it tires them, just seems they have a better mind the rest of the day!. We worked on tracking but did't keep it up. She's IGP working lines, American/German on bottom and those Sant Kreal lines on top -
I always love conversational threads, you aren't hijacking at all - excuses for more photos: here's my girl between 4 - 6 months, tucked up but ribs covered.
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