I'll just add this in case the testing doesnt give you answers.
Anorexia exits. Although nearly ALL cases of dogs who do not want food has an underlying medical cause.
But some dogs simply have anorexia. There are drugs that work very good for it..At one point they stopped making one type so we had so we had to switch. They increased Sayblees aggression. So from then on i handfed her.
https://vcahospitals.com/know-your-pet/anorexia-in-dogs
