Ownership certificate

Not sure if this is the right flair! There is this horse named echo that 2 years ago in march I was handed a certificate to. Basically I’m good friends with her owner and she was my therapist for a while, we decided that I would hand her 2 dollars in return for Echo. This exchange went down and she handed me this certificate that says Echos name, the date it was signed, and the owners signature(this was a printed certificate but a real signature). A little while later it turned out that Echo wasn’t actually mine and we were “helping out financially”. What I mean to ask is if I could use this to actually gain ownership over Echo or if she already is mine?

*I would like to clarify I am in NS, Canada!