Check for Dehydration Learn to accurately observe and judge your horse"s vital signs. When you know what's normal for him (called a baseline), you?ll then know when something?s wrong--and whether it?s time to call your veterinarian. By Equisearch | August 13, 2013 | 1 minute read Your hardworking trail horse can easily become dehydrated. This handy allyslot chart tells you how to perform two dehydration checks, plus gives you normal readings and red alerts. undefined VitalSignsChart What did you think of this article? Submit Rating Thank you for your feedback!