I agree with some of the other comments; this started right after he ate that mystery meat and I too am wondering if it has to do with the missing girl. My heart breaks for you, I know you just want your dog back! If you can find even a shred of that meat, have it tested asap. And maybe bring the dog to a vet, get any physical/medical issues crossed off. Then see if you can find someone who practices magic/banishing? Good luck! Please keep us posted!