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Stay with one food brand. If changing the diet, do it gradually. It may make sense to feed a "balanced" diet by feeding it an array of different puppy foods, but this will only cause the puppy to have an upset stomach. Reputable dog food brands will contain the essential nutrients needed to help the puppy in its developmental stage. The diarrhea will stop in a day or two.
Mild diarrhea can be treated at home. Such small animals are sensitive to external variants that may cause diarrhea. Feed them a bland diet of broiled chicken and rice until their stomach is stabilized.
Use probiotic supplements to stabilize the diarrhea. Probiotic supplements contain beneficial bacteria that helps the break down of food and help promote healthy bowel movement. The beneficial bacteria resides in the intestinal tract where it helps break down food. Use a probiotic system that is formulated for puppies.
Consider possible allergens. If the puppy has passed a clean bill of health at the veterinarian office, yet they still suffer from diarrhea, then the puppy may be allergic to a certain ingredient in the food list. Take a sample of its droppings and bring it to the veterinarian for them to see what ingredient the puppy may be allergic to.
Make sure that the first ingredient in the ingredient lists is meat. When changing the puppy's diet, make sure that turkey, chicken or organ meat are the first type of ingredients that appears in the ingredient list. Beef, lamb and pork may be too rich for a puppy, which may cause it to have bouts of diarrhea. Avoid these ingredients.
Check to see where the puppy is drinking from. Water is part of the puppy's diet and it may be getting it from a source other than its dog bowl. Do not let your puppy drink from a puddle, pond or toilet. Water from these sources may contain contaminants or poisonous agents.
Dehydration is dangerous. This is especially true for puppies due to their small size. Puppies are sensitive to dehydration and electrolyte imbalances that may be imposed by the diarrhea.