Because this breed is so small, when a female is going to be paired with a male, the female should weigh more than the male. This is a key component in aiding the dam to carry well and deliver with the least possibility of complications. The male should be under 4 pounds (1.81 kg) or 4 pounds maximum.
The male's parents should be between 4 and 5 pounds (1.81 kg to 2.26 kg ). Doing this, will give the female Yorkie a better chance of being able to have her puppies naturally. When these guidelines are not followed, there is a greater chance that the female will need to have a cesarean section.
With this in mind, the dam should be between 5 and 7 pounds, with 7 the desired size.
This occurs approximately every 6 months. It is not exact. All dogs are different. If you keep a calendar of when your Yorkie enters heat, you should be able to determine your dog's particular schedule.
Signs of Heat:
* A leak of clear fluid for a couple of days
* A change to a cream colored fluid
* A change to blood, this may be a light pink color in toy breed dogs
* Enlarged vulva, on a Yorkie the vulva may be moderately enlarged
When the bleeding stops, your Yorkie may still be in heat for a few days. If you carefully touch the base of her tail and she moves her tail to the side, she is still in heat.