My 13 yr old Senegal has been drinking a lot of water for about 1 yr. He will fill up his crop so much that he sometimes regurgitates. He does this throughout the day. I have always taken him to an avi vet regularly. In fact I have already had him twice for this problem. He has a full CBC & lead check every 6 months. My vet says that his kidneys are adequate but he is probably using the excess water to subsidize for the function his kidneys may be lacking. Does this seem reasonable? Should I get a second opinion?