I think this happens much more commonly than anyone realizes.  We were
given  a hound puppy once who moved right in with our current mama cat and
kittens and nursed.  I swear he thought he was a cat :-)  Another time my
mil's dog died shortly after giving birth.  Her other dog had given birth 3
days before.  At first we rotated the pups, a litter at a time, to nurse
until  the newborns gained in size and strength, then mama dog just had 6
pups instead of 3.  I tried bot fdg puppy milk (formula) to help    out but
they didn't need it and it was a mess so I gave it up quickly.  (that was
before I found  LLL :-)   Sincerely, Pat in SNJ

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