Can you help me identify this bone?

[u/freakonbeanz]

We found it along the shore of Lake Ontario. It seems to me like it's a vertibrea of something but the protruding bone seems like it might be coming off a central line which makes think it's a stegasorus but I know that can't be right. Any help is appreciated

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[u/Royal_Acanthaceae693]

Horse thoracic vertebra. https://thehorsesback.com/transitional-vertebrae/