Homeopathy demonstrates that a substance that produces a certain set of symptoms in a healthy person can cure a sick person having those same symptoms. If you have a cold and your symptoms include a runny nose, the likely remedy would be Allium Cepa, which is made from onions. A homeopathic medicine is diluted immensely, often in parts per million.
Homeopathic medicine stimulates the defense systems, allowing the body to heal itself.
The amazing thing about homeopathy is that the more dilute the medicine becomes, the stronger the potency. Just like most holistic treatments, the effects are usually gradual. A history of the specific health problem is very important in homeopathy. This is because prescribing medicine is based on the law of similars, just explained. Symptoms considered important to a homeopathic veterinarian are far more in number than those considered important to an allopathic vet.