Crack Rhino 4 Why Does My Senior Horse Have Loose Stools?

Why does my senior horse have loose stools? - crack rhino 4

I have 2 horses, horses that are on or near my property. These are the people in their twenties. I have just been their vaccines, including Potomac horse fever, flu, Rhino, West Nile, and tetanus. The mare has had loose stools, while my horse has had normal bowel movements. I feed them 3 -4 liters each feeding Nutrena Senior times a day. Is the food too rich for them? What kind of food or dietary supplements should be with her? In addition, joints and neck to do something to break or crack, not all the time, but sometimes. What it could mean they need a joint supplement? What do I want? What did Senior Flex brand.