Fainting or near Fainting. Rapid Heartbeat â Tachycardia. When the heart beats too quickly (usually above 100 beats per minute), the lower chambers, or ventricles, do not have enough time to fill with blood, so they cannot effectively pump blood to the rest of the body.
If a horse has two copies of Gray, all offspring of this horse will be gray. Research indicates that horses with one copy of Gray often retain some of the original pigment while homozygotes tend to progress to almost completely white. Gray is found in many breeds and is the predominant color of the Lippizaner breed. Gray horses have a high incidence of dermal melanomas that are commonly seen around the tail and head. Over 70% of Gray horses older than 15 years will develop melanoma.
A green horse (or rider, for that matter) is a horse that has little or no training. Usually a horse is referred to as green after it's saddle broke, otherwise it's considered unbroke, halter broke, etc. When it comes to showing, a green horse is often a horse that has had less than 1 to 2 years of showing experience. Other times it's a horse with less than 2 years of under saddle training.