I'm very sure it is over-eating. Pekins and especially Pekin drakes are known to be unstoppable eating machines. Let him drink as much water as he likes, maybe add a little sugar and salt, it will help him pass the gas. - And don't be near when the gas leaves the duck!I will try the multi vitamins. we have been giving him feeder fish to try and give him more nutrients as we suspected that may be the cause.
We did just pressure wash and repaint the house, but we used lead test purchased from home depot before scraping all the old chipping paint away. We also did our best to keep all paint chips out of the duck area (I haven't seen any in there)
