Our Sunny is 9 months and just started bleeding for her first heat. For the last week or two prior she kept humping all other females and licking them. We have a female who is still lactating...she keeps trying to nurse on her! Guess her hormones are going bonkers! Its actually kinda funny cuz she's bigger than the lactating momma who is 4 years old. Anyhow, we've never experienced vomiting from heats in any of ours. Definitely keep an eye on her. Our 4 year old's heat before last was almost 5 weeks of some spotting. Each female is different but will most likely bleed for at least 2 weeks, minimum. Watch those two extremely carefully for even the two weeks after bleeding has stopped!
Females heat cycles usually are about 3 wks./21 days. approx the 9th day is when they start being the most fertile, and they will swell. But be careful when you think it's over-do not let her around full males. I once had a dog, who got bred after I though her heat was over. It would be good to give her a bath, when her cycle is over, also.She will smell better! Some females will ge very "emotional" when they are in heat!
“It came to me that every time I lose a dog they take a piece of my heart with them. And every new dog who comes into my life gifts me with a piece of their heart. If I live long enough,all the components of my heart will be dog,and I will become as generous and loving as they are"