no you should take him/her to the vet immediately
There is a possibility that the puppy may pass away (die of a horrible and painful death, thanks to whoever did not take care of the puppy properly)
blood does not pass across the placenta
can you pass blood cells during sex
before
Oxygen and other gases pass through the capillaries.
by pumped blood
what veins does it pass through
nothing too serious, it'll probably pass.
Of course it is. It's difficult to keep any animal. But, if you properly take care of the puppy there are many more positive things then negative from a puppy. After you pass the slightly difficult puppy stage and you do it well you'll have a loving companion for the next 15 years or so.
oxygen
The liver filters the blood.
Both red and white blood cells pass through the capillaries.