Bailey started having loose stools about 3 weeks ago. First morning would look great, then as the day went on, it would get loose. We took in a stool sample and they sent it to the lab and it came back positive for Giardia. She was treated with a 5 day course of medicine and stools started firming back up. After about a week they were back to soft. We took in another stool sample and they sent it out again figuring it was still Giardia since puppies can be tough to treat, but surprisingly it came back negative. They gave us (well we paid big bucks for) a digestive supplement to stabilize her, but it has done nothing and basically her stool is liquid. She only goes when we take her out anyway, she is not having any accidents or urgency, but it's definitely not good. I have placed a call to the vet to see if there is something I can give her. She is on a probiotic made by GNC that we got from Petsmart and put her on when she was on antibiotic for the UTI. She has been off the antibiotics for over 3 weeks now. She eats Chicken Soup for the Dog Lover's Soul Large Breed Puppy and has done well with it until 3 weeks ago. She's been eating it since she was 8 weeks old and is now almost 21 weeks. She did just start a new bag of it about 3 weeks ago.