My puppy (a pug that is almost three months old) is having diarrhea with some blood occasionally. This happened straight after we started providing it with more food. The change was due to the fact that we could not measure the food intake in the last couple of weeks, but after we acquired a measuring cup, we doubled the intake because we found out that before we were providing half of the daily recommendation.
Now the dog is as playful as before, has no temperature, has a large appetite, and drinks water normally.
What is the most probable cause of the diarrhea?