10/08/2025
Itchy horses everywhereโฆ.
More than anywhere else I ever lived, I see itchy horses in Florida, some with severe skin problems. Also more often than anywhere else I hear owners say โand I tried everythingโ. What do all of these owners have in common? They didnโt consider their horsesโ metabolism and (no matter how often you tell them not to) feed industrial grain, sugar, oil, etc.
Let's take a closer look at the horse's metabolism: The horse - like any other mammal - disposes of waste materials via various excretory organs:
The intestines essentially excrete indigestible waste, but also waste that is disposed of by the liver. Gaseous waste, such as CO2, is excreted through breathing.
The kidney is responsible for excreting all water-soluble substances that are passed into the bloodstream by the liver, the detoxification organ. However, the kidney only has a limited disposal capacity and also has a whole range of other, more important tasks; it ensures that the acid-base balance, the mineral and water balance and also the blood pressure are kept constant.
If the kidneys are overloaded, the body is able to dispose of waste products through the skin if necessary. Studies have shown that the sweat glands function in a similar way to the renal tubules and use the same mechanism to transport waste to the outside with sweat.
This waste, some of which is very aggressive, ends up on the surface of the skin that is not designed to deal with toxins like these. Slight skin irritation occurs. These lead to inflammatory reactions of the immune system, which then concentrates in the skin to ward off bacteria, fungi and other pests that invade the inflamed skin. If the saliva of blood-sucking insects is added, the immune system overreacts and thus leads to allergic behavior. Scratching causes small injuries in the skin, through which more germs can pe*****te and stress the immune system. In addition, the skin will of course continue to be irritated by the waste that is excreted through the skin.
In some horses, the metabolism is so overloaded that the skin becomes the main excretory organ. These horses scratch their entire bodies and even itch in the winter. In addition, in many cases there is a chronically inflamed intestine. Its mucous membrane cells release large amounts of histamine, which increases susceptibility to allergies, especially in the skin. In affected horses, the acid-base balance in the connective tissue is often disturbed, the liver is overloaded by the many circulating waste products that cannot be excreted, and the body is only able to maintain metabolic processes with difficulty. What begins as a harmless tail rub can end dramatically and have a huge impact on your horseโs performance.
The problem with the underlying causes of sweet itch is that they cannot be seen in blood work. Values that indicate renal insufficiency, i.e. poor kidney performance, only become noticeable when 70% of the kidney has already been destroyed - far too late. The acidification of the tissue cannot be seen either because the body keeps the blood pH value strictly constant.
Only the values that indicate an allergic process are noticeable, as the allergic reaction of the overloaded immune system becomes visible in the skin. However, the allergy is not a cause, itโs just a symptom, an effect of the disturbed metabolism. Many horses with eczema develop additional symptoms such as chronic cough, f***l water, colic, poor hoof growth, poor shedding and even metabolic syndrome or Cushing's, plus they are often tired and weak.
Most eczema cases have a disturbed (large) intestine flora. Therefore, therapy should always begin with optimizing the feed and cleaning the digestive tract. The main focus here is to reduce sugar and acids. If possible, concentrated feed (that is any form of grain, balancers, beet pulp, treats etc) should be completely eliminated for six months and then switched to crushed barley or oats, depending on the horse.
Please also read the article on KPU and consider a kidney and liver cleanse for 6 weeks in the fall and spring when horses begin to shed.
I'm happy to give you more information during your next appointment.