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it sounds like he's going through his teenage rebellious phase - we had that with all 3 of our 'boys'. It lasted for 4-6 weeks with each of them and was a hard time! Don't get him castrated, it doesn't help and ruins his coat. Try keeping him on a long lead and go back over his recall training. I don't know if this will help, but I'm pretty sure this phase will pass.
Neutering can help some dogs, but it does change the coat and alters the metabolism, so if you can train through it, it would be better. However, if you come really unstuck, you can get an implant by the name of Suprelorin which blocks testosterone from the pituitary gland. It can make them worse for a few weeks, but once it really gets going it can be a tremendous help, but as I say, if you can train through this, it would be better. A lot of vets dismiss Suprelorin (because they want to neuter) saying it only lasts 6 months. A lot of people say it lasts much longer though, anything up to a year. Don't let your vet persuade you to try a Tardak injection instead, because that really does screw some dogs up big time and can cause aggression. You might like to shop around a few vets, because some charge too much for Suprelorin. So ask around as to who uses it, and how much they charge if you need to go down that road.
There's a lot of 'growing up' going on at his age and yes I know several of mine have gone off their food at around that time. If he's a good weight then try to stick with the food that suits him...he won't starve himself (forever:))
My youngest was very skinny even on raw, and then he and the other young one decided to test me by not eating raw or anything else for more than a couple of meals. I persevered and finally they eat very well. I can't honestly say a surplus of testosterone came into the equation though!