I remember there was a racehorse syndicate in Classic Corrie. I can remember Fred and Mike being two of the owners, and there was some skullduggery which led to someone getting rid of their share. I can't remember is they all got out of it in the end.
I do NOT remember Tim having a horse called Tiny though!
Edit - I googled!
Tiny was a horse that Sally bought in May 2019 alongside Yasmeen, Jenny and Sinead. Sally had been conned into thinking she was buying a purebred horse called Heracles.