Fox meat itself is nontoxic. When you say poisoning, it may be a seasoning problem or meat deterioration. What is the reason? You have to go to the hospital to find out before you can prescribe the right medicine.
By the way, there is another possibility that the fox is greedy and steals poisonous or drugged food. Poisoned. But your mouth is more greedy, and you secretly eat fox meat. That's poisoning.