Horses usually mature at the age of 4-5. Often they reach full height at three, and then fill out when they are four and five, but it really varies depending on the horse.
This also depends on the breed of horse as some breeds like Trakhners mature very slowly and take time. So they can actually add more height as they get older. Thier are cases of some warmblood horses still growing in size until they are as much as 8-9 years old. Draft horses and any breeds that mature extremly slow can take a long while to mature and grow.
Many western horses (Quarter horses/Paints) are often full grown at 6 or 7 years old
In the U.K. horses can only get a Life Height certificate at the age of 7. Until that time they can get annual height certificates. Most horses/ponies continue to grow until they are 7 years old.
The horse will have a short coat in the summer. They shed their thick winter coats during the spring so they can stay cool in the summer.
Most forage for grass under the snow. Will eat anything plants they can find if needed to survive.
Dogs grow thicker winter coats to keep warmer in winter. The signal for dogs to grow their winter coats is the length of daylight each day; as it declines, the dog's body reacts by growing a thicker coat.
u should only put a blanket on during winter. later fall and early spring u can have a light blanket on. horses do grow there own winter coat that is (don't quote me on this but) 10x warmer than a blanket and you should let them grow that for a little before u put a blanket on them. also younger horses do not need a blanket they should grow there coats out.
Horses typically need blankets during colder seasons, such as fall and winter, when temperatures drop below their comfort level. Blankets help keep them warm and maintain their body temperature. It's important to monitor the weather and your horse's condition to determine when a blanket is necessary.
no.
Horses, like many mammals, shed throughout the year to accommodate the seasons. Horses coats naturally grow to be thick enough to keep them warm in winter and thin out again for spring. They are as thick as they need to be.
Horses don't generally have thick coats. They are short in the summer, but thicker and fluffier in the winter :)
You should clip any horse in the winter that is doing enough work to sweat a lot, because with their winter coats they take longer to cool out and get colder with their heavy coats preventing the sweat from evaporating. Clipped horses should always be blanketed at least at night and it is an act of kindness to leave the legs and long whiskers on the chin unclipped.
Icelandic horses have adapted to the harsh winters and have learned to dig for food. They are small which means they do not require as much food as a larger or heavier horse. They grow exceptionally thick winter coats which are very oily to help shed moisture and they stay in herds for body heat.This, coupled with people caring for them has allowed them to survive on the island.
The horse will have a short coat in the summer. They shed their thick winter coats during the spring so they can stay cool in the summer.
Horses have winter coats kinda like cats and dogs. I should know I have been riding for 2-3 years and the horses and I learned that while I was brushing one of them. I got this from experience Hope I answered your question 
Horses hair changes with the season and the length of the days. as the says grow longer as winter approaches, horses hair gets thick for the cold but most horses unless they are custom to living outside, still have to wear thick coats. as the days grow shorter, they start to shed the hair bringing back their light summer and spring coat.
Most forage for grass under the snow. Will eat anything plants they can find if needed to survive.
Wool is appropriate for winter coats.
Grow thicker coats, store food for winter, and put on pounds of fat.
In the winter days the yaks grow their coats in full but in the summer days they will shed most of it.