Oh, poor boy. I really hope that Mister only has a UTI. My boy Scruff had the same issue back in 2007. Here is the link to my thread I posted:
Scruff
Maybe that will help you out a little if it is stones. Try Cranberry Tablets....you can get them at Walgreens or Walmart. It did wonders for Scruff. I hope he is okay and gets better soon. Please keep us posted.
Bookmarks