I saw this article on FB from Equine Medical Associates, Inc of Oklahoma. (They helped horses during massive storms previously. Good people.)
Today, they shared this article from Grace Owen, DVM.
WARNING: PHOTOS ARE GRAPHIC. DON’T SCROLL IF YOU ARE SENSITIVE.
From Dr. Grace Owen:
Different types of grass awns like foxtail or cheatgrass can cause discomfort in your horses mouth. During a routine dental these lesions under the tongue were discovered. The patient had no outward signs of pain. The other case pictured presented for foul smell and drooling and is obviously more advanced. In both cases the sharp bladelike grass penetrates the mucosa in the mouth and creates painful sores. They can be removed but are usually uncomfortable and may require your veterinarian to give sedation. Once removed, the mouth will heal quickly. Watch especially round roll hay for these types of grass. Also keep an eye on your equine partners mouth. If you are concerned have your veterinarian perform an oral exam.
1
Example of cheatgrass found in round roll of hay
You can see the bladelike grass creating lesions in this patients mouth. This patient showed no signs of discomfort and lesions noted on routine dental.
Removal of cheatgrass
After removing the cheatgrass
Another example of lesions created by cheatgrass. This patient had a foul smell coming from the mouth and was drooling.
MORE ABOUT CHEAT GRASS
I found this article linked here.
Cheatgrass
Bromus tectorum
Did you know?
Seedling roots continue to grow throughout the winter!
How did cheatgrass get here?
Cheatgrass was introduced to North America through contaminated grain seed, straw packing material, and soil used as ballast in ships sailing from Eurasia. This first occurred between 1850 and the late 1890’s. During this time, abusive use of rangelands, coupled with drought, left many Great Basin rangelands in poor condition. Cheatgrass was able to occupy areas where the native vegetation had been reduced, beginning its persistent march across the landscape. It can now be found across the landscape from the bottoms of desert valleys to mountain peaks as high as 13,000 feet. The plant communities most affected by cheatgrass invasion are those below 6000 feet in elevation. These include the pinyon/juniper woodland, sagebrush, and salt-desert shrub community types.
What are its characteristics?
As a winter annual, cheatgrass seeds germinate at low fall temperatures. Seedling roots continue to grow throughout the winter, and by spring, are capable of out-competing native species for water and nutrients because most native vegetation is just getting started. Cheatgrass completes its life cycle quickly and can become dry by mid-June. Perennial grasses like bottlebrush squirreltail 
and Basin wildrye still contain about 65 percent of their moisture at that time. Cheatgrass is a prolific seed producer, and large seedbanks can develop. It only takes a few plants in a sagebrush/perennial grass community to produce enough seeds to overwhelm native perennials in seedling-level competition.
Why is cheatgrass a problem in the Great Basin?
The keys to cheatgrass spread are its short life cycle and prolific seed production. Because cheatgrass stands dry out by mid-June, fires are more likely to occur earlier in the season. These mid-summer fires are tough on native forbs and grasses. Cheatgrass seeds drop prior to fires and will germinate with fall precipitation. This gives rise to dense, continuous stands that make additional fire ignition and spread more likely. Fire return intervals have gone from between 60-110 years in sagebrush dominated systems to less than 5 years under cheatgrass dominance. With every reoccurring fire, cheatgrass becomes more dominant and expands its range further.
How can we fight this weed? 
Eradication of cheatgrass from large areas is not a reasonable goal. Efforts should focus on reducing cheatgrass dominance and increasing perennial vegetation. Increased livestock grazing in early spring helps lower seed production and reduce fuel for fires, but it is doubtful that this alone will help restore more productive species. It is important to remember to remove grazing pressure as native plants begin to flower. Herbicides easily kill cheatgrass, but are not normally cost effective. Some herbicides damage desirable species as well. For small-scale control, refer to the Weed Management Handbook on the University of Wyoming Extension website.
Reducing the frequency of burns in an area is essential for native plants to produce seed and increase vigor. Because it is difficult to establish native plants under cheatgrass dominance, revegetating with competitive, introduced species like crested wheatgrass and forage kochia may help reduce fire frequency and aide eventual native plant establishment. Also, greenstripping may be used to trim down large expanses of cheatgrass to smaller parcels for fire containment and protection of intact native communities.
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