Green Prairie Animal Hospital · Large Animal & Equine Care · Mason County, IL
You’ve had horses long enough to know the basics. But knowing something and doing it consistently are two different things — and in central Illinois, the seasons have a way of making even experienced horse owners cut corners they shouldn’t.
Here’s what the large animal team at Green Prairie Animal Hospital sees most often — the care gaps that show up on farm calls across Mason County, and the reminders that are worth hearing even if you’ve heard them before.
Winter Feed Management Catches People Off Guard Every Year
Summer pasture covers a lot of nutritional ground. When it’s gone, the math changes fast and horses lose condition quicker than most owners expect if the transition isn’t managed deliberately.
A horse’s energy requirements increase in cold weather — maintaining body temperature burns calories that pasture was previously covering. A horse that looked good in October on the same hay ration can be noticeably thin by February if nothing changed in the feed program. Body condition scoring — a standardized system that evaluates fat cover over key areas like the ribs, spine, and tailhead on a scale of one to nine — is the most practical tool for tracking this. You should be able to feel ribs with light pressure but not see them. If you can see ribs from a distance in winter, that horse is behind.
Increase forage before you increase grain when adding calories in cold weather. Hay ferments in the hindgut and generates heat as a byproduct of digestion — it’s the most efficient way to help a horse stay warm from the inside. Grain provides energy but doesn’t generate the same digestive warmth.
Water intake drops in winter when sources get cold or freeze. A horse that’s drinking less is a horse at higher colic risk — the most common winter colic trigger in central Illinois is dehydration slowing gut motility, the normal movement of the digestive tract. Heated water buckets or tank heaters are not a luxury in an Illinois winter. They’re basic herd health management.
Spring Is When Parasite Pressure Builds — And When Mistakes Get Made
Pasture contamination with internal parasite eggs — primarily strongyles, the most economically significant parasite group in horses — peaks as horses return to spring grass. This is not the time to skip fecal egg counts and assume last year’s deworming program is still working.
Anthelmintic resistance — the ability of parasites to survive chemical dewormers — is a growing and documented problem in Illinois horse populations. The products that reliably cleared strongyle burdens a decade ago are less effective in some areas than they used to be. Rotating dewormers on a fixed calendar schedule without knowing what you’re dealing with accelerates resistance rather than addressing it.
Fecal egg count reduction testing — running a fecal egg count before treatment and again two weeks after — tells you whether the product you used actually worked on your property’s parasite population. If egg counts aren’t dropping significantly after treatment, resistance is likely and your protocol needs to change.
Spring is also when bot flies — insects that lay yellow eggs on horse legs and can be seen attached to the hair — become active. Bots are a different parasite category than strongyles and require a specific product, ivermectin or moxidectin, to treat effectively. Your large animal veterinarian can help you build a parasite management program that’s based on what’s actually on your property rather than what’s on the packaging.
Hoof Care Gaps Show Up in the Mud Season
Central Illinois springs are hard on hooves. Repeated wet-dry cycles — muddy conditions followed by dry hard ground — cause the hoof wall to expand and contract, leading to cracking, chipping, and white line disease, a bacterial and fungal infection that invades the junction between the hoof wall and the sole.
White line disease — sometimes called seedy toe — starts as a chalky or crumbly area at the bottom of the hoof wall and works upward if untreated. It doesn’t always cause obvious lameness early on, which is why it often progresses further than it should before it’s caught. Your farrier should be checking for it at every trim, and any chalky or hollow-sounding section of hoof wall warrants a closer look.
Thrush — a bacterial infection of the frog, the V-shaped structure on the bottom of the hoof — thrives in wet muddy conditions. It produces a dark, foul-smelling discharge from the frog sulci, the grooves alongside and in the center of the frog. Mild thrush responds to topical treatment and improved footing. Severe thrush that’s been ignored long enough can penetrate into sensitive tissue and cause lameness.
Pick hooves daily. It takes two minutes and catches both of these conditions before they become significant. It’s the single highest-return daily habit in equine care and the one most commonly skipped when schedules get busy.
Teeth Don’t Wait for a Convenient Time
Dental floating — filing sharp points and hooks from the cheek teeth — gets scheduled when it’s easy and postponed when it’s not. The problem is that dental pain doesn’t take a season off.
A horse with significant sharp points is uncomfortable chewing every single day. That discomfort shows up as dropping feed — called quidding, where partially chewed hay falls from the mouth — losing weight despite adequate feed, resistance under saddle, and head tilting while eating. By the time these signs are obvious, the dental issue has usually been building for a while.
Most adult horses need floating once a year. Young horses between two and five years — going through the transition from baby teeth to permanent teeth, a process that involves shedding 24 deciduous teeth — often need evaluation every six months during that window. Seniors over 20 may also need more frequent attention as teeth continue to change with age.
Don’t wait for obvious symptoms to schedule dental work. An annual float on a routine schedule is far less expensive than treating the weight loss, choke — where feed material lodges in the esophagus — or behavioral issues that develop when dental problems are left to progress.
Mosquito Season Means Vaccine Season
Eastern Equine Encephalomyelitis, Western Equine Encephalomyelitis, and West Nile Virus are all mosquito-transmitted neurological diseases present in Illinois. EEE in particular has a fatality rate in unvaccinated horses that makes missing a year a serious gamble — not a minor oversight.
Core vaccines for Illinois horses — EEE, WEE, West Nile, tetanus, and rabies — should be administered in spring before mosquito populations peak. Timing matters. A vaccine given in July offers less protection for the early-season exposure window than one given in April.
If your horses are going to shows, trail rides, or events where they’ll be in contact with horses from other operations, discuss rhinopneumonitis and influenza vaccines with your veterinarian before the season starts — not after your horse comes home sick from an event and you’re trying to figure out what happened.
Green Prairie Animal Hospital’s San Jose Clinic — Mason County’s Large Animal Team
For horse owners in Mason County and across central Illinois, Green Prairie Animal Hospital’s San Jose location handles all equine care — wellness exams, dental floating, Coggins testing, lameness evaluation, parasite management consultation, and farm calls throughout the region.
You don’t have to haul for routine care. The San Jose team comes to you — farm calls are a standard part of how the large animal practice operates across Mason County. As an AAHA-accredited clinic, the protocols behind every farm call and every exam meet the highest standards in veterinary medicine. That accreditation means current protocols, trained staff, and diagnostic rigor — not just a minimum standard to keep operating.
Call San Jose for Equine Care in Central Illinois
Green Prairie Animal Hospital’s San Jose location is our large animal and equine center for Mason County and central Illinois. Our team handles horses, cattle, and livestock — and we do farm calls.
