The talk about unexpected problems possibly being due to eating deficiency makes me think of a story many probably know but perhaps not everyone. Jeff King has talked and written about one of his important early screening criteria when selecting pups to be trained for long distance competition being that they will eat whatever is offered at any and all times and circumstances. Among other things his racing food provisions for his dogs involved custom 'sausages' that were made to his exact specs, that he could use to be sure his team had the nutrients and amount of food inside them that they needed for whatever terrain or distance or weather was coming up next, as long as he could be sure they would always promptly eat up whatever he offered.
But that characteristic did occasionally create problems. In one stage race he was doing a nighttime feeding of his team by the trailer, and as he completed the circle, he noticed one of the first dogs he'd fed was still eating. Checking that out, he realized that an emergency flare about the size of the 'sausages' had fallen out of the trailer and the dog, having finished the food he'd given it, was feasting on this windfall.
He checked to see the exact contents of the flares, frantically phoned poison control sources, was told what the dog must be given immediately, called area vets until he got a human, explained, put the dog into truck and took off, per instructions, to meet the vet.
But the two of them could *not* get the antidote down this world class athlete who didn't want a horrible substance put into it. Vet was very concerned as speed in getting antidote into dog was essential and it wasn't happening. Jeff asked the vet if there was a dog dish and some kibble available. Vet said yes but no dog would willingly ingest this repulsive antidote. Jeff pointed out that they were not getting anywhere with current tactics and that the reason they were there was that the dog had been voluntarily munching an emergency flare, which it thought Jeff had included with its dinner.
So they fixed the dog dish of kibble, antidote included, Jeff offered it to dog, and down it went. Problem solved.