Angelique, it is possible that diarrhea can be caused by the bully sticks or beef bones. The main concern is the beef bone because it can become obstructed and rupture the intestines. Other possible common causes in a puppy are parasites, infections, ingestion of a foreign body, etc.
In this case, I would recommend a hands-on examination with a veterinarian and a fecal analysis as an initial screening test. In the meantime, this is what you can do:
1- Do not give things like Pepto Bismol or Imodium. You see, stopping diarrhea with medication can make things worst if this is related to an infection or ingestion of a foreign body.
2- Change her diet to rice (75%) and boiled boneless chicken or ground beef (25%) until the stool is back to normal then wean her back into her regular diet.
3- Supplement with a probiotic, these are friendly bacterias that help with regularity. You can buy this over the counter in any pet store.
4- Follow up with your family veterinarian for a hands on examination and fecal analysis as an initial screening test.
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