A past client called today looking for help. His dog (7 year-old intact Yellow Labrador male) has become extremely lethargic immediately after a meal. He goes to his kennel, and refuses to move for several hours. During this time, his eyes glass over (as described to me by the client). He has been to his vet, done blood-work and a sonogram, and they are unable diagnose the issue. The dog has been fed Pro Plan Sport for the past several years, and otherwise appears to be in good health. Does anyone recognize these symptoms, or have any ideas of what may be the issue?