What ungual phalanx?

[PODIGGER]

Found this bone in the Peace River, FL last week.  I have been attempting to narrow down an id since then.  I believe it is an Ungual Phalanx but have not been able to determine from what.  It measures 35 mm long x 35 mm wide and 33 mm tall at the highest point.  As such, it is larger than what I can find for deer or llama and smaller than than what I have found for Equus or bison.    That has led me to an old post from @Shellseeker that resulted in a giant tortoise id for an ungual phalanx and makes me think this could be another.  It was found in a spot that produced several tortoise leg spurs and large shell pieces on the same day.  I am hopeful someone can provide an ID.  Thanks.