Thank you, ladies!
Why I asked I noticed my paint gets extremely nervous and touchy every month. And I'm guessing if it's "in heat" period. I started calendar last month to see when it'll be again. For about 3 days she's VERY hard to work with. But she doesn't squirt, or pee, or does other "non usual" stuff. BTW with my other girl she randomly has a bad mood, but it's not something periodic (at least I didn't notice).
So the normal cycle is 28 days if I'm not mistaking. Do they have deviations (like women)? I mean can it be 30 days or 20 days in between?