It takes approximately half an hour to suit up if you have someone helping with the laces and buckles. The armor goes on over a gambeson, which is a quilted tunic.
Keep in mind that armor varied in quality by time period. During the 1200s it was entirely chain link with possibly a full metal breastplate. By the 1400s, there was more plate armor. Full plate armor was obsolete almost as soon as it was invented and quickly became regulated to tournament use. The Battle of Agincourt showed the disadvantages so clearly that it was rarely used in battle after that.
The only animals that were ever armored on a regular basis were horses. Dogs might have been as a matter of show, but horses needed some armor to protect them in battle and on the tourney field. It was considered unchivalrous to strike at the horse, but it happened in battle. A general term for horse armor was called barding.
In the Lord of the Rings movie THE TWO TOWERS, you can see Denethor being armed by his aide.
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