Possible causes:
* Hemoglobinuria: This is a condition where red blood cells break down and release hemoglobin into the urine, causing the urine (and potentially blood) to appear dark. This can be caused by various factors, including infections, toxins, and certain medical conditions.
* Sepsis: A severe infection that can cause blood clotting problems and affect the color of the blood.
* Internal bleeding: This could be caused by trauma, injury, or other medical issues.
What to do:
* Immediately contact a veterinarian. This is a medical emergency.
* Provide the veterinarian with as much information as possible about the puppy's birth, any complications during the delivery, and any other symptoms you are observing.
* Follow the veterinarian's instructions carefully.
It's crucial to seek veterinary attention as soon as possible if you notice any unusual blood color in a newborn puppy. This could be a life-threatening situation, and prompt treatment can significantly improve the puppy's chances of survival.