A. Diarrhea and vomiting in a puppy that young could have several causes: 1) it may need to be wormed 2) it cannot handle its solid food (it really still needs its mommy's milk) 3) it could have a serious infection like canine parvovirosis. If your puppy is also lethargic and cannot hold down water (ie vomits its water) you need to take it to a veterinarian ASAP as parvovirosis can be lethal. If your puppy is happy and playing and does not appear sick otherwise, then you can get some dewormer and worm it. You may also supplement your puppy's food with puppy milk, and feed often , and small portions at a time.
A. For a puppy at this age my first suspicion would be that intestinal parasites are causing these symptoms. Every puppy has to be dewormed at least 3 times during their early puppy years to rid them of worms (because they can easily get them, and roundworms are transmitted through the dam).
I would recommend that if you haven't already had your puppy's stool checked at a vet then you should. There are over the counter dewormers available that contain the active ingredient, Pyrantel Palmoate, and these are ok, however there are over 5 different kinds of worms commonly seen in puppies and Pyrantel Palmoate will only treat 2 of them (hookworms and roundworms).
If worms are not the cause then puppy could have dietary indiscretion (eating something he shouldn't have). This will upset the stomach and intestines and cause similar symptoms. Sometimes supportive care like Famotidine (pepcid ac) @ 0.5-1mg/kg every 12 hrs, Pepto-Bismol (1/4 tablet if under <5kg, 1/2 tablet if b/w 5-9.9kg, 1 tablet for 10-24.9kg and 2 tablets for >25kg) and a bland diet like Purina EN Gastrointestinal (canned) or a boiled chicken and rice or cottage cheese can help alleviate symptoms of Gastroenteritis. Giving puppies electrolyte replacement in the form of something like Pedialyte can also help keep him hydrated. All of the supportive treatments can be done for 2 weeks if successful. However if things don't improve within the next 24 hrs you may have to visit your vet for additional medications and/or more diagnostics.
A. Withhold food for 12-24 hours. Allow small amounts of water or unflavored PediaLyte. Resume feeding a bland diet (1:1 ratio of plain boiled boneless chicken and plain white rice). Feed in small, frequent amounts waiting at least one hour between feedings. If the vomiting stops, continue feeding until the stool is normal. Transition slowly to the regular diet. If the vomiting or diarrhea donâ€™t stop, see your veterinarian.
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