Well it's been a few weeks since Duke was diagnosed with Giardia. It seems that the Giardia is gone but the loose stool remains. I contacted the vet and she has given us another round of the antibiotic and also a probiotic. He's also on a chicken and rice diet since Sunday. We are 2 1/2 days into the antibiotic and 3 days into the probiotic and there the stools are still loose. He is having smaller bowel movements and tonight the stools were orange and greenish looking. I'm starting to worry and plan on contacting the vet again tomorrow. I've been racking my brain for any other possible cause. I wonder if the fact that the cat has been hissing and chasing him more lately than ever before can be causing him stress and effecting his bowels. The dog is clearly afraid of the cat and won't walk by her without one of us. Prior to all of this occuring, his stools were normal. Does anyone have any thoughts/suggestions? Thanks for your help.