The color of stool is closely related to diet. Dogs that eat dog food have little change in stool color, mainly dark yellow. If they eat omnivorous food and have more liver, their stools will be black.
If the color of stool suddenly changes, it is necessary to consider whether you have eaten abnormal food or are sick. In order to nip in the bud, it is suggested to send the dog to the pet hospital as soon as possible to ensure the dog's health.