How Long Each Heat Cycles Lasts
This can last from 2 to 4 weeks. Each cycle may be different from the one before it. For example, your Yorkie's first heat may last 2 weeks and her next one may last 4. She may stay on a dependable schedule for years and then it may begin to vary.
At What Time During Heat a Yorkie can Become Pregnant
A dog can have a successful mating on the very first day, however, the most fertile days will be 10-14 days into the cycle.
If you are not planning on having Yorkie puppies
or and want to avoid having mixed breed pups, it is vitally important to keep her in the home as much as possible and when outside, have her on a short leash. Pheromones will be released, mixed into the urine each time she goes to the bathroom. Therefore, male dogs from literally miles around (up to 3 miles) may sense her presence. You may notice that stray male dogs are roaming around your property.
Never allow her to go outside alone, even for a moment. She should be supervised at all times when outdoors. A larger male dog may injure her and it only takes a few minutes for a dog to mount her and tie. This is not a good time to go for walks at the park or in any areas that there may be males present. If you need to take her to the vet during this time, crating is recommended.