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Diarrhea in dogs can be caused by a variety of factors, including dietary indiscretion, infections, parasites, and more serious underlying health conditions. The presence of bloody or black stools is particularly concerning as it suggests that there may be bleeding within the gastrointestinal tract, which could be due to conditions such as colitis, ingestion of a foreign body, or even a clotting disorder.

Given that your American Staffordshire Terrier has had diarrhea multiple times a day for three days, but it is no longer ongoing, it's important to monitor his condition closely. The fact that he has been diagnosed with heartworms is also significant, as heartworm disease can lead to serious health issues, including problems with the lungs and heart, which could indirectly affect his digestive system.

At home, you should ensure that your dog has access to clean water at all times to prevent dehydration. You can also offer a bland diet, such as boiled chicken and rice, which can be easier on his digestive system than his regular food. However, do not make any sudden dietary changes without consulting a professional.

If your dog's diarrhea has stopped, continue to observe him for any signs of distress or recurrence of symptoms. If the diarrhea resumes, especially if it is bloody or black, or if your dog shows other signs of illness such as vomiting, lethargy, a lack of appetite, or signs of pain, these are indications that he needs to be seen by a veterinarian promptly.

In the case of heartworm disease, it is crucial to follow the treatment plan prescribed by your veterinarian, as this condition can be life-threatening if not managed properly. Treatment typically involves medications to kill the heartworms, but this can be a delicate process that needs to be closely monitored by a professional.

For your dog's safety and well-being, keep an eye out for any of the following symptoms, which would necessitate an immediate visit to the veterinary hospital:

- Persistent or worsening diarrhea, especially if it is bloody or black
- Signs of dehydration (such as dry gums, weakness, or sunken eyes)
- Vomiting, especially if it is frequent or contains blood
- Severe lethargy or unresponsiveness
- Difficulty breathing or coughing, which could be related to heartworm disease

It's also important to keep up with your dog's preventive care, including vaccinations and flea and tick prevention, as these can help prevent a variety of diseases that could complicate his current health issues.

If you have any additional questions, please don’t hesitate to come back to us! Thank you.