Most of the time, unless your dog has eaten a long white string, anything that comes out of the stool that looks like that is worms. They are long and flat and look like strings, but they are a parasite. It can become potentially dangerous to the animal, and I would suggest a trip to the vet. However, if that is not an option, dewormers are sold in Wal-mart and pet stores. You just follow the directions and mix it with their food. Good luck.
Meat can cause constipation but I wouldn't say bloody stool. You should immediateley talk to a doctor.
Oranges
It's possible that it is your body's natural lubrication to pass the stool or tapeworms.
No blackish stool is a problem related to intestine I don't think they are related
One does not usually ingest radioactive isotopes, however if one did I expect the initial effect (if you were not poisoned by the elements concerned) would be to for the radiation (alpha or beta) damage the tissues in contact with the isotopes. This would cause them to bleed and the blood would indeed cause the stool to be dark. However, that would be just the start of your problems.
Most antibiotics have the potential to cause either loose stool or runny diarrhea. The chance of dry stool or constipation is very low from taking antibiotics. However, some illnesses need a combination of meds so another medication may be causing the dry stools. For example, a doctor might prescribe a decongestant and an antibiotic. The decongestant would be more likely to cause constipation or dry stool.
The inability to secrete bile can result in grey-white poop because bile is responsible for giving stool its brown color. When bile is not present in the digestive system, the stool may appear gray or white. This could be a sign of a liver or gallbladder disorder, and it's important to consult a healthcare professional for further evaluation and diagnosis.
An infection would cause pitbull to have a swollen eye and filmy white stuff coming out of it.
yellow stool dye #5
White feces could be large amount of fat being present in your stool. Although this would usually present as a grayish color, it could be a serious health issue such as "dumping syndrome".
It should not cause death as it is non toxic but it would be unwise to eat it. It is an evaporating fluorocarbon solvent which can be quite cold and so in theory may cause frostbite. The mixture is a very weak skin irritant. The string may cause damage to uphostery and vinyl surfaces.
I would check the dosage, and take your dog to the vet ASAP. This sounds serious.