It probably wasn't UC, because an antibiotic would have no effect. It was likely some kind of irritation to her little gut.
I had luck with my cat's colitis (blood in her loose stool) by switching to grain-free food. But of course all animals have the runs now and then, just like people, and it's hard to determine exactly why. My theory is she eats something she found to play with...
Glad the pup is better!
49 year old female attorney, diagnosed UC/pancolitis 1985, no surgery but much suffering. Asacol maintenance for 20+ years; used prednisone & Rowasa for flares. Probiotics (Ultimate Flora, 50 billion), salmon oil (omega-3) when I can remember.
August 2008 sought care of naturopathic doctor. Food sensitivity test showed wheat/gluten, other intolerances; eliminated wheat/gluten from my diet.
Bad flare in March, used prednisone. Humira denied, started Remicade 4/12 and doing great~ learning what normal is~ wow