I rescued a around 3 week old. I am new to this so I am sure I have made some mistakes but first few feeding were pedialyte. He perked up after that then swapped to powdered goats milk for maybe 2-3 feedings before realizing it was notnok and switching to the puppy formula that starts with an e that everyone recommends. He eats well and poops every time with stimulation but o my pees a few drops and his belly seems a bit larger than the rest of his body and tight. Help! What else can I do for him? I have tried running like warm water over him and stimulation.