A Shih-Tzu will be in heat if they lack of water. For example, when you are walking your Shih-Tzu you need to bring a bottle if water for your dog. Sink water preferable. You can also tell if your Shih-Tzu is in heat by seeing if he or she is sticking its tongue out. Running and playing can lead to heat and giving the dog water after she or he plays is preferable.
If you mean on how long it takes for you Shih Tzu to have puppies, it will take 9 weeks to 2 months. If you are asking on how long it will take your Shih Tzu to give birth, probably a few hours.
It is no different for a Shih Tzu to go into heat than any other dog. First the genitalia will swell, there may be some bloody discharge, and she will also act as any female does when uncomfortable She will do a lot more genital grooming also.
Twice a year same as most breeds
every 6 months
like any other breed, about 20 to 30 days
Every 6 months.
For female animals, they go in heat about every 6 months.
When the boxers are on heat, they usually mate just like the cats.
Dogs usually go into heat twice a year, although some individual dogs will go into heat more or less often. Typically, a female will remain in heat for about three weeks, although she will only bleed for the week to a week and a half.
most female goes go into heat every 7-8 months
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being bred does not matter leapords go into heat around Jan. - Feb. heat last for females 7 days at most
As with most dog breeds, Great Danes will go into heat approximately every 60 days throughout the spring and summer.
American bulldogs go into heat between 1 and 2 times per year. This provides a limited window for breeding and reproduction.
If she's in heat, most definitely. Often a bull will go look for the cow that is in heat, no matter if he's the neighbor's bull or not.
Every 6 months to a year is normal.
Every six months on average.