During the warm, longer days of spring and summer a mare will go into season or estrus every 2 to 4 weeks until she gets pregnant or cold weather sets in. For several months when days are short and the weather is chilly her cycles may go dormant or may be less noticeable. This can vary with individuals and is never set in stone.
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A horses hair is longer in winter months and then it sheds out in the summer.
wild horses by The Sundays
yes.
In late fall or early spring
Horses are usually vacinated yearly.
Yes, donkeys often graze with horses.
mares are in season in the late winter so the foals get borne in the spring or summer. and also the mare stays in heat for 7 days or less. Mares come into "heat" every month. Gestation for a horse is 11 months.
ticks
"The Funeral" by Band of Horses
yes and any other season too
No. Horses grow thicker hair at the start of the winter season or when the weather starts to turn cold. During the spring, they shed the excess hair they grew to help keep their bodies warm.