Wow, that is so strange! Wellness makes such a great product, it's hard to imagine what could have caused that reaction. They don't use anything other than natural ingredients, I don't think. Does Teeko have any allergies? Perhaps it's something in the turkey, how it's processed? Very strange! I'd be interested to hear what the company says! Did you try a second can? I'm sure you don't want to see him reacting like that again, but maybe yesterday's was a "bad" can? If you have an unopened can, maybe the company can test it somehow! Hope Teeko's feeling ok!