well letting the father into see the pups all depends on the female some let them in straight away some attack the male my sister breeds dogs and she keeps the male there with the bitch all through the pregnancy and labour and then they allow the male to see them when they want
i dont know about the cats sorry have you tried looking on google for the answer?
people can see them right away but not to touch them they can touch the pupps about 3 weeks old but never out the mothers sight