From third hand information, I gather that these are the Creata/Winner's Choice molds sculpted by Candace Liddy. Circa 1999, Creata stopped producing them (in the middle of "series III"). There apparently was a copyright violation by a company called "Toob". Breyer bought the line (through Candace, bankruptcy?) and began producing them in 2005.
Grey rearing Andalusian
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Grey rearing Andalusian
Photo provided by Alicia.
Light grey Flat Walking Tennessee Walking Horse
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Chestnut Cantering Tennessee Walking Horse
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Dapple Grey Cantering Tennessee Walking Horse and Dapple Grey Standing Grey Horse
Photo provided by Alicia.
Bay American Saddlebred
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Buckskin American Quarter Horse
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Buckskin and Red Chestnut American Quarter Horses
Buckskin part of the 2005 Breyer Mini Whinnies Stallion set. Chestnut part of TBD set.
Photo provided by Alicia.
Chestnut pinto American Quarter Horse
Part of the 2005 Breyer Mini Whinnies Stallion set. Photo provided by Dorothy Graham.
Cantering black leopard Appaloosa, trotting brown leopard Appaloos drafter
Photo provided by Alicia.
Cantering dun (Starlight), standing brown horse (Prancer), black prancing Morgan (Belle)
Image by Breyer. Part of a "Saddle Club" special available in October 2008 (free with purchase of $30+).