I'm chuckling at your remark about animals loving Robert Vaughn. One of the episodes he was in on Murder, She Wrote had him as a stable owner, and I remember thinking that the horses seemed quite fond of him.
Ahhh, I forgot about the horses, too! The horses adoring him is really something because, according to an interview of his I read that was around the time of Hustle, he actually confessed that he was afraid of horses, and mused on the irony that he did so many Westerns and had all those horseback scenes, but, like his fear of drowning and the water scenes, did the scenes anyway.
But I guess it must have helped that the horses liked him, though! 💜