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.
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.
Every six months on average.
Every 6 months to a year is normal.
Should be the same as every other dog. Twice a year.
On average once every six months for two weeks.