Because mammal babies drink their mother's milk after birth, so the female needs to stock up on essential nutrients. This also benefits the male before and after mating.

Because milk is softer than water, and baby mammals do not drink water any way. The baby grows in the female's stomach which is also where all food and drink is digested. The male has to know that he is drinking the same as his mate to feel happier.

Because milk goes easy on a mammal's stomach, meanwhile not hurting the baby during the female's pregnancy. It also provides extra nutrients for the male, which is essential.

Because milk is silky and silk is very soft, so therefore milk will go easy on the stomach and the baby for the female, and provide vitamins and nutrients for the male.

Because milk is rich in vitamins which are essential during mating, pregnancy and childbirth.

A day to a week.

Up to two months.

Maybe a little more than 60 days, like reality.

One to three weeks.

Shepherd Spaniel

Cocker Shepherd

Spaniel Shepherd

Shepherd Cocker

Nothing. You cannot cross-breed dogs on Nintendogs.

German Spaniel

The puppy can eat solid food, so it would survive.

Nothing.

The puppy would die.

You cannot sell them until the puppy is an adult. It needs its mother's milk to survive.

The puppy would automatically become an adult.