Hi Dodgeluver,
There are many reasons your puppies may be dying that include serious worm infestation, flea infestation causing anemia, herpes virus, and bad milk from mom or congenital health issues. It is sometimes referred to as fading puppy syndrome.
This site has information on fading puppy syndrome.
http://www.hydeparkvet.co.uk/pethealth/dogdisease1.asp?disease=Fading+Puppy+Syndrome
You can read about herpes here:
http://www.2ndchance.info/herpesvirusdog.htm
This site goes over ways of helping save fading puppies.
http://showdogsupersite.com/kenlclub/breedvet/fading.html
You should get at least one of the puppies checked to determine the cause.
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Thanks,
Jane


