Watery Stool More Condition_symptoms Why Does My 7 Week Shih Tzu Puppy Has Blood In His Watery Stool?

Why does my 7 week Shih Tzu puppy has blood in his watery stool? - watery stool more condition_symptoms

I have this little dog in 5 days. Have this morning, I notice that I seem to have loose stools and LT to blood in him. I am very worried and the vet appointment. It was only on Friday. Can any of you let me know what happens to him? Thank you again.