Hello Sully’sMom!
The first thing to do is to do a fecal test – which I’m sure you probably have done.
I had the same problem with my Newfypoo (newfoundland+ standard poodle) puppy. I tried canned pumpkin twice a day, and probiotic yoghurt but his soft serve poop never went away. I had to finally introduce a digestive enzyme into his diet. The one I use is on Amazon and is made by naturvet. http://www.amazon.com/NaturVet-Digestive-Enzymes-Pets-1-Pound/dp/B009O31QXY/ref=sr_1_1?ie=UTF8&qid=1407154566&sr=8-1&keywords=digestive+enzymes+for+dogs
Good Luck!
