Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
How does your puppy seem now?
My top concerns when we see diarrhea especially with blood is that this is probably not related to food unless there was an overhaul of the diet being fed and this was an abrupt, not gradual change. Instead I worry this could indicate an intestinal worm problem (hookworms, roundworms) or a viral problem (such as parvovirus). If there is persistence of diarrhea especially if bloody today then this is becoming a medical emergency. He needs to be tested for parvovirus (which is an easy in-house test your vet or emergency vet can do). The sooner that is diagnosed (or ruled out) the better because the longer therapy is delayed the more difficult it is to achieve a successful outcome in treatment (they can die from this). He is also too young to have persistent fluid loss.
Therefore, my top recommendation is to take him in to be seen today, if he has persistence of loose stool (or new vomiting or lethargy or lack of appetite) especially if still bloody. If you are not able to take him in right away, let me know. I have a few at-home suggestions you could try but please understand if this is parvo then at-home treatment will not work.
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