She said the ponies had come from the circus and were probably not looked after as well as they could be, especially Tonto.
"I think because of his size and his proportions, he was considered a freak of nature, but he's not."
Ms Sinclaire said the two were quite dependent on each other. "If I lead one away from the other, they will call out to each other."
However, a new horse has been added to the mix and Tonto has put his foot down. "He's a stallion, he's trying to protect his territory, which is Betty, and every time he sets eyes on this other horse, he tries to kick out.
"In his brain, he is a full-sized stallion, he would just follow Betty anywhere. I don't know how long they have been together, but I imagine it's quite a while."
Ms Sinclaire said Tonto was born to miniature parents and was lucky to survive as long as he had. "He's about the size of a fat sheep, he's got big knees, and a very short neck."