It is bad for horses to wear blankets as you can read in the related link. The only time you would need to blanket a horse is if you rob them of their protection from the cold by clipping them. In this case the blanket is the lesser of 2 evils, even though it is still really bad. To tell if the horse needs a blanket, touch his ears. If they are cold, he is most likely cold. If not, he probably isn't, so leave him unblanketed.
They need blankets in the winter time, so they can keep warm.
your horse usually needs a blanket when its raining. Some people say when it is windy but, that is not true. Horses hairs stick up when the are cold to keep them warm (just like us).
you can't. the blanket will only go on your horse when the horse is sick.
usually winter when it gets cold out. sometimes for horses health or medical problems.
You should blanket your horse in the winter months if you are located in a cold area. You can also blanket your horse on nights before a show in the winter but its mostly recommended you put the horse in an available stall.
If you blanket a horse at the beginning of Autumn then it has to stay on until warmer weather comes around again as the blanket prevents the horse from growing it's winter coat. Without the the natural hair coat or the blanket the horse could become susceptible to influenza. You can also blanket a horse with a thin blanket in the summer. This keeps the flies away and prevents the horses coat bleaching in the sun.
it depends on the weather,season, and the kind of blanket
You can put a heavy blanket on a horse in the winter to help keep the horse warm and keep dirt and mud off. Also you can keep a very lightweight blanket on the horse in the summer to keep dirt,dust,and mostly flies off your horse.
They were used to close the horse blanket around the horse. It's a giant safety pin. Used before velcro and leather tabs with buckles.
Measure your horse from the middle of his chest to the middle of his tail. The number of inches will be the blanket size.
Winter I should imagine.
A horse blanket...? :/♥