NinaJD makes an excellent point in watching for high sugar/starch levels in a complete feed, especially for “easy keeper” ponies.
I have worked with a lot of senior horses whose total diet has been Timothy pellets (Mountain Sunrise and Standlee are both generally available but also check for “local” brands). They have nothing added and tend to be soft enough that even toothless seniors can handle them. Along with this, they should receive a quality complete supplement –
look at https://www.smartpakequine.com/smartvite-thrive-senior-pellets-11447p or https://www.smartpakequine.com/smartvite-perform-senior-pellets-11448p
plus some Omega-3 like https://www.smartpakequine.com/omega-horseshine-182p
Older horses make less saliva, so any feed or hay may need to be wet down to compensate for this.
Patti Woodbury Kuvik
in Vail AZ