She will go into heat approximately 6 months after her last heat, which was when she conceived the puppies. I hope you are not planning on breeding her then. It is much too hard on them to be bred in back to back heats. Why not spay her now and she will live a longer life due to being healthier. Will cut down greatly the risks of mammary tumors, pyometria, uterine cancer, perianal tumors, etc.
A Yorkie is a type of dog, and dogs do not menstruate. The bleeding they have is what occurs when they are in heat. The only animals that menstruate are human beings and other primates.
The cat can go into heat in as little as 2 weeks if not sooner.
From 59 to 72 days. They go into heat again within hours of giving birth.
A yorkie is usually in heat for three weeks.
The male should have been separated from the female before she gave birth. But if you didn't do that, then the male should be separated before the female is done giving birth because females go into postpartum estrus (heat) after giving birth and can become pregnant again immediately. If the male is with her after giving birth, then she is most likely pregnant again. Back to back pregnancies can possibly kill the female or lead to babies less likely to survive.
As many as they can. Female cats take nine weeks to carry their pregnancy and after giving birth, they can go into heat again and have more babies.
When she comes back in heat. In the wild they don't wait, so I don't see why it would be different in domesticated situations.
A guinea pig can get pregnant again, a few hours after birth, so a guinea pig could breed tens of times in a lifetime. But there is a 20% chance a female guinea pig could die during, before or after birth, because of the stress, it has been given.
until the female has giving birth
They can get pregnant again, immediately after they give birth. So if you don't want more baby rats, keep the male rat in a separate cage when the mother is giving birth.
If your yorkies vagina is big, it might mean she is about to go into heat, leaving the state of it. Or She is just in heat
As soon as she next cycles but is recommended that you only breed a goat once a year.