Fifty years ago I saw a puma crossing the railroad tracks near Fort Smith, Arkansas. It was late at night and I was coming home from work. Never have seen another one in this area but game cameras say they are here.
Seems like it would be very hard for a big cat like that to remain unseen in a place like Dallas.
There have been reports of cougars for years in Plano. The "experts" always say that the sight really was just a bobcat.