Ideally, you will want to have a full health exam done before any mating...This allows for testing to rule out possible genetic issues that could be passed down through breeding...Some dogs will not be given the okay to be bred. However, in a case of accidental breeding it is important to bring the dam for a full and complete check up right away.
Everyone who comes into contact with your Yorkie must be exceptionally gentle with her. Proper care and feeding
should always be provided and one must be keenly aware of her needs at this time.
She should be given a warm, soft and comfy area to rest; if you do not already have this for her. As the weeks pass, she will want to spend more and more time in this quiet area, retreating to nest. Even a dog that normally wants to be very close to their human family members often will now want an area that is a bit separate...perhaps in the corner of a quiet room.
As her appetite increases, be sure to offer enough food. It may be best to switch from scheduled meals to free-feeding. However do be sure to keep the food fresh. Do not just 'top off' the bowl, but instead scoop out the older food at the bottom as this may accumulate over time. Once per day, wash both food and water dishes with hot water and dish soap.
You'll want to keep exercising the dam so that she is in good shape for the delivery, however do limit runny and certainly limit jumping. A nice 15 to 20 minute walk twice per day on relatively level sidewalks is best.
Do not offer any extra supplements at all unless you first check with the veterinarian. Giving a pregnant dog extra calcium during pregnancy can leave her very vulnerable to an Eclampsia infection post-pregnancy.