The reasons why dogs are in good spirits even though they poop black water:

1. Black poop means bloody stool: if there is blood, it means eating something that scratched the intestinal wall. Or it has not fully recovered. If there are parasites in the body, it will also cause loose stools and bloody stools.

2. Bleeding in the anterior segment of the digestive tract: It may be that the dog accidentally ingested foreign objects and scratched the intestines, such as the stomach, duodenum, jejunum, and ileum, resulting in bleeding from the stomach or foregut.

3. Melanin food: If the dog eats food rich in melanin, loose stools will be caused by indigestion.

4. Infection with intestinal parasites: This can also cause intestinal bleeding and loose stools. If the loose stools are frequent, it is recommended to go to the pet hospital for examination.

How to treat dogs with black and loose stools:

1. Dogs suffering from canine distemper or enteritis can also cause dogs to loose black and loose stools. There is loss of appetite, fever, vomiting, etc. If this occurs, the dog should be taken for treatment in time.

2. If the owner usually feeds too mixed food or suddenly changes the food, it may cause the dog to react nervously, leading to diarrhea. You can usually feed the dog some probiotics. When feeding the dog, ensure a fixed amount. Feed the dog only 70% full each time. Don’t eat too much.

3. Parasites in the puppy's abdomen will also cause black and loose stools. The owner should take the dog to the pet hospital for a urine test in time. If there are worms, they must be dewormed in time. Deworming should be done approximately every three months.
4. If the examination is because the dog accidentally ingested a foreign object and scratched the intestines, the dog must be treated promptly according to the doctor's instructions to avoid more serious problems.