My puppy has bloody diarrhea but is playful. Should I be concerned?

I am very sorry to hear that Theodore is experiencing these problems, I am sure it is very unsettling for you both. There are a number of potential causes of such clinical signs, including dietary indiscretion, pancreatitis, parasite infestation, infection, and ingestion of a toxin or poison. In young puppies eating something they shouldn’t have and gastrointestinal worms are very common. If you haven’t done a de-worming treatment with Theodore yet it would be a good idea to. Broad spectrum puppy safe dewormers are available at most pet stores and at your local veterinarian.

Because you have only noticed these signs over the course of a few hours I would continue to monitor Theordore at home. Here is what you can do for him;

Rest his gastrointestinal tract by holding back food for a few hours. Then you can continue with a bland and easily digested food of the boiled chicken breast and white rice diet and provide plenty of fresh water. I also find that boiled, mashed skinless sweet potato is helpful for diarrhoea.

If Theodore does not improve, has profuse vomiting or diarrhoea, you notice more fresh blood, He seems lethargic, in pain or depressed I would advise a trip to the veterinarian immediately.

Here are some links to helpful resources for you;

https://www.petcoach.co/article/most-common-causes-of-diarrhea-in-dogs/

https://www.petcoach.co/article/6-things-you-can-do-at-home-if-your-pet-has-diarrhea/

I hope that answer was helpful and more importantly that Theodore feels better soon. Warmest regards to you both.