My basenji had similar periods, when in puberty... I learned he was eating too much protein. We switched to raw, I have cut his portions and he is eating regulary.
He will eat anything when with other dogs, that doesn’t mean he likes it, he just doesn’t want other dogs to eat it.
Relax, offer him food after walking. Get him tired, come home and give him food. If he doesn’t want it, pick it up.
I prefer raw food, but that doesn’t mean That’s your only option. My problems are gone since on raw. Do your research and find food he likes. Wach for proteins, If you feed kibble, up to 24% of protein is enough.