| Name | Color | Sex | Year of birth | Microchip | Sire | Dam | Breed | Breeder |
|---|---|---|---|---|---|---|---|---|
| Summer Tan | bay | c | 1952 | Heliopolis | Miss Zibby | Thoroughbred | USA | |
| Summer Theatre | d.-bay | f | 1998 | Ide | Key To The Safe | Thoroughbred | USA | |
| Summer Time | br. | f | 1937 | Bull Dog | Rose Leaves | Thoroughbred | USA | |
| Summer Time Guy | bay | c | 1976 | Gummo | Linda Summers | Thoroughbred | USA | |
| Summer Trush | bay | f | 1913 | Roquelaure | Thoroughbred | Great Britain | ||
| Summer Tun | bay | f | 1957 | Tenerani | Sun Lane | Thoroughbred | Great Britain | |
| Summer Wind Dancer | grey | f | 2000 | Siberian Summer | Native Wind Dancer | Thoroughbred | USA | |
| Summer Wind Storm | grey | f | 2000 | Storm Cat | Ingot Way | Thoroughbred | USA | |
| Summerdale | br. | f | 1959 | Royal Coinage | Planetess | Thoroughbred | USA | |
| Summerhill Spruce | bay | f | 1983 | Windjammer | Sharper Still | Thoroughbred | Great Britain |