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If your dog is eating and drinking and otherwise seems to be acting fairly normal for a puppy, then it is possible that diarrhea with blood could be due to parasites or protozoan infections like giardia or coccidia. However, if your dog is refusing to eat or has other symptoms, then it is probably not just parasites. For additional information about worms, see this site
Common dewormers are Panacur, which is a prescription product so you need to obtain it from your Vet and it works on roundworms and whipworms. Wormers labeled as Pyrantel Pamoate are the best over the counter medication for roundworms. Drontal plus is also a prescription product and is used for the treatment of Tapeworms, though dewormers with praziquantel work well against tapeworms. Many heartworm preventatives also help control whipworms and roundworms. Another reason to keep your dog on Heartworm medication.
Coccidia manifests as mild or severe diarrhea depending on how infected they are. If it is severe, there may be blood and mucous in the stool along with voming and loss of appetitie leading to dehydration You can read about it here:
Information on giardia
Symptoms of giardia are diarrhea with possible terrible smell, mucousy stool and sometimes bouts of vomiting.
Other causes could be anal growths, infected anal glands and inflammation within the large intestine. You can read about the various cause of red blood in the stool here:
Parvovirus typically causes loss of appetite, vomiting, diarrhea that is bloody and smells incredibly bad which leads to dehydration and can cause heart failure. Parvo can kill extremely fast with most dying from 48-72 hours after symptoms appear. I suggest he be seen by your vet as soon as possible to check for parvovirus. If the pup just stopped eating in the last day or so, there is a good chance of survival if it is parvo and a new drug Tamiflu is administered quickly.
Tamiflu is a new treatment for parvovirus but it has to be given within the first 48 hours of the symptoms appearing (loss of appetite). With this treatment given in a timely manner, I've had 100% recovery with numerous litters and puppies having parvo. For this reason, I urge you to have the puppy seen immediately and if it is indeed parvo, ask about Tamiflu and if the doctor doesn't know about it, insist they look up the information. You can read about it here:
A puppy can become dehydrated quickly, so it is important to keep them hydrated with pedialyte and put a drop of pancake syrup on the pup's tongue to keep the glucose level up.
I hope this information is helpful to you. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have .