
Hi and welcome!
I have a young dog who ever since puppyhood (from about 4 months of age) had sloppy poo whatever I did. It was only him, his littersister was fine all along, as were all my other dogs- I tried every food I could think of, medication etc, you name it, we tried it. In the end the one and only thing that worked was feeding him raw meat and bones only. He's doing great now.