Hi, I am Dr. Peter and would like to help.
1- Any blood in the stool?
2- Any vomiting?
3- Is she lethargic or behaving normal?
1- yes blood in stool
2- little vomit
3- behaving normal
1- How often is she defecating?
2- Is the feces mainly blood; or, mainly feces with streaks of blood?
1- very often its just a little at a time
2- blood and a jelly mucus
These bowel movement sound more like intestinal parasites. With parvo there is severe bloody diarrhea, vomiting and the dog is very depressed or lethargic. I will recommend that you get him dewormed; use a dewormer called Fenbendazole give it for 3 days at label dose and repeat after 3 weeks and 3 months. Could buy online, pet store or vets office. In the meantime, change diet to rice (75%) and chicken (25%) and give 1 teaspoon of plain yogurt twice a day.
If stool gets worst and no improvement have him checked by your vet.
If you have additional questions I will be glad to answer them.