From the size you describe, it's the big one with a long tail. The only other one with a footprint coming close to a cougar is a Lynx, and I'd bet on a Cougar before a Lynx.

Carnivore track sizes


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).