Common Health Issues In Puppies
Common illnesses and diseases that affect puppies
1.  Coccidia - Almost every breeder who has 1 or 10 litters a year ends up having coccidia and I have had it in my kennel as well. I now believe I have come up with a solution to keep the puppies from having coccidia. I mix 30cc of Corid (9% oral solution) and one cup of sugar with enough water to fill a gallon plastic milk carton. Shake it well and that is all the puppies get to drink from the time they are 3 weeks old. I have had no incidence of coccidia since I have been using the Corid water. Corid can be purchased by the gallon at a livestock feed store or through the catalog at KV vet supply. 
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2.  Clostridium and Campylobacter - Sometimes 1 or more puppies in a litter stop eating, their stool may be loose with a little blood and they may be lethargic. Some of the same signs of parvo but to a lesser degree. If you are sure it is not parvo then you should have the puppy stool sample checked for clostridium and campylobacter. But it has to be checked with a stained slide because almost all the stools are checked only by flotation and neither of these can be detected that way. If undetected, puppies can die from them and it sometimes is blamed on a new form of parvo. Clostridium can be treated with Erythromycine in the liquid form and Campylobacter with metronidozole or amoxicillin. Early detection and treatment can keep your puppies healthy.  (please look up all antibiotics and know what they are)

3.  Metronidozole -  I found that if some puppies were treated more than once with metronidozole for Giardia that they developed white tipping on their hair. Blacks and chocolates would look like blue and red roan ponies. It would slowly appear and sometimes effect the whole coat. In about 3 or 4 months it would disappear, especially if they started to shed. Puppies born with miss marks, like black and tans, will not loose them.(More common in Labs than in any other breed so far with the color change.)

4.  Parvo - I have found that puppies that start their vaccinations at 5 wks with the killed parvo virus vaccine and continue with a proper vaccine schedule that includes the KP vaccine, are less likelly to endure the Parvo virus.  Of course no vaccine will keep a puppy/dog from catching the virus if the puppy/dog comes into contact with the virus.

Please be aware that I AM NOT A VET, but thease are my and others experiences and I am sharing them with my friends and co-breeders across the world.
Mar Vista Animal Medical Center
Great place to find some answers to your questions..
QC Supply
Great place to supplys to disinfect your kennel/home/or where your pets go..
I use TekTrol..