Winter and summer are the times of years that our older horses may struggle the most due to the extremes in temperatures. Winter in particular is when owners find their older horses may lose condition. As they tend to be thinner, with less muscle and fat than younger horses they have less insultation to keep them warm and must expend more energy to maintain their body temperature on those colder days and nights. If this is coupled with a decreased calorie intake due to a lack of pasture, they may be caught in a cycle of losing weight.