Poisoning & Toxicity


Exact Cause of Toxicity Deaths Still Unknown

July 21, 2006

Researchers at Texas A&M University (TAMU) in College Station, Texas, say they strongly suspect that the pesticide used on feed at nearby Carousel Acres was directly involved in the death of 27 horses. However, the reason for the extreme... Read More


Veterinarians Investigate Toxicity Deaths

July 20, 2006

Twenty-seven horses have died in what appears to be an accidental poisoning at a Brazos County, Texas boarding barn, reports The Bryan-College Station Eagle, a local newspaper.

Preliminary reports suggest that the horses' feed... Read More


Australian Toxic Feed Case Decided

July 06, 2006

An Australian court awarded $71,000 in damages after a Sydney area family’s Thoroughbred mare died and three other show horses were permanently retired due to heart conditions resulting from contaminated feed, the Sydney Morning... Read More


Dealing with Old Injuries

June 01, 2006

I have a 20-year-old Quarter Horse that is in top working condition, worked daily in basic dressage, and he is always happy to jump whatever I ask him to. However, before I purchased him, he had a deep wound in his offside flank. It’s long been... Read More


Nightshade and Ivermectin: A Deadly Mixture

May 01, 2006

Editor's note: When researching the unknown illness story on this page, the following study on ivermectin's interaction with a noxious weed was discovered. Nightshade and other poisonous plants should be eliminated from pastures.... Read More


Four Horses Dead, One Ill; Dewormer Questioned

May 01, 2006

Four horses on a South Texas farm died from unknown causes in February; one horse is recovering. The horses' owner suspects the problems might have been caused by a dewormer; she has necropsy and other test results, but she has not released them... Read More


What Was Causing Foal Abnormalities?

May 01, 2006

I have bred and raised 142 Morgan foals since 1976. During that time, we've had eight foals born with a very similar set of problems--contracted front tendons, an underbite, lethargy, hypothyroidism, and/or mental deficiency. We tried bottle... Read More


Bute: How Much is Too Much?

January 01, 2006

Phenylbutazone (PBZ), commonly known as Bute, can be the horse owner's (and horse's) best friend. This popular and economical non-steroidal anti-inflammatory (NSAID) blocks pain, reduces swelling and inflammation, and lowers fever, making it an... Read More


Tennessee Feed Recalled

November 18, 2005

Tennessee Farmers Cooperative officials voluntarily recalled four lots of horse feed in early and mid-November after a horse's death was linked to the feed, which contained high levels of a livestock drug. The 10% Grain Mix (item #93638) was... Read More


Clover Photosensitivity

October 01, 2005

A rainy, cool summer in Manitoba, Canada, was turning to fall when Thunder, a 2-year-old Paint/Arab cross gelding with lots of white across his body, began to show signs of colic. He was treated for colic four times in two days. Annette Fleming,... Read More


Black Walnut Tree Shavings as Trail Mulch?

April 01, 2005

Q: This summer we are planning to start making riding trails on our heavily wooded property. As we cut down the branches and trees, we plan to chip the wood to mulch the trails. However, we have a good number of black walnut trees, and I am wondering... Read More


Adverse Effects Associated With Systemic NSAIDs

January 01, 2005

Non-steroidal anti-inflammatory drugs (NSAIDs) drugs are an important component of therapy for equine pain, but according to researchers at North Carolina State University's (NCSU) College of Veterinary Medicine, overuse and misuse of NSAIDs can... Read More


Is Millet a Problem in the Pasture?

November 01, 2004

I am considering moving my two mares to 10 acres of land that had been planted with millet feed last spring. Because of the lack of moisture, the millet only grew to be about five inches high, then dried out and died. I am going to wait and see... Read More


Horse Care in the Fall

September 28, 2004

Fall deworming is important; winter is usually when internal parasites do the most damage and rob the horse of vital nutrients. By fall the worm eggs and larvae eaten during spring and summer have matured and are living in the digestive tract unless ... Read More


Good/Bad Effects of Antioxidants

July 01, 2004

In a society that is trying to slow the aging process, free radicals and antioxidants are terms that are regularly tossed around. One might not realize their importance in horses, but researchers continue to pursue the details of how and why the... Read More


Can Horses React to Poison Ivy and Poison Oak?

July 01, 2004

Q: There is quite a bit of poison oak and poison ivy on the acreage where I keep my horses. I have recently added a 2-year-old Thoroughbred mix, and she immediately broke out on her legs and muzzle with small rash-like,... Read More


21 Kentucky Horses Lost In Flooding

June 09, 2004

One farm in Stanton, Ky., on the Red River lost 15 babies, five broodmares, and a stallion to flooding on Sunday, May 30. Heavy rains that day rapidly forced waters higher in the already swollen river, and within three hours the river had covere... Read More


Mangoes Toxic to Horses?

June 01, 2004

Q: In our horse paddock there are four mango trees. Our horses often eat the mangoes that fall off the tree. We were wondering if it is possible for our horses to get sick from eating too many mangoes. A: Mango has not been reported... Read More


Are Grass Clippings Toxic to Horses?

May 01, 2004

Q: A friend swears that I put my horses at serious risk of "grass tetanus" by mowing my pasture with a rotary finish mower. He says that all of the short pieces produced by small, high-speed equipment expose so much of the grass... Read More


Million Dollar Jury Award in Equitrol Lawsuit; Farnam Plans Appeal

April 14, 2004

(Updated Story) A jury awarded $1,007,500 to plaintiffs who alleged in a lawsuit that Farnam's Equitrol, a feed-through fly control product, was defectively designed and caused harm to their Thoroughbred and Warmblood sport horses.... Read More


Equitrol Lawsuit

April 07, 2004

A jury has returned a verdict of $1,007,500 to plaintiffs alleging in a lawsuit that Farnam's product Equitrol, a feed-through fly control product, was defectively designed and caused harm to their horses; Farnam has countered with a press... Read More


Alsike Clover Poisoning

April 01, 2004

Q: I'd like to see more information on alsike clover sensitivity, especially in horses with large areas of white skin such as Paints, pintos, and Appaloosas. All the information I can find suggests that the only problem you will... Read More


Oranges for Treats?

March 01, 2004

Can horses eat oranges? I just bought a 4-year-old gelding who apparently loves oranges.... Read More


Kentucky Pasture Monitoring Programs

January 22, 2004

Comparing pasture samples from 2002 and 2003 didn't associate mare reproductive loss syndrome (MRLS) with anything other than the Eastern tent caterpillar. However, Wayne Long, MS, of the University of Kentucky's (UK) Department of Agronomy,... Read More


Problems for Horse Owners Caused by This Summer's Wet Weather

October 14, 2003

From Penn State University's Dairy & Animal Science News

The wet weather this summer has not only increased the price of quality hay, but creates the right conditions for increased mold, fungi and mycotoxins in hay and... Read More