The Phins play the NFC west this year. SF, St. Louis, Arizona, and Seattle.

Traditionally, the only times they have a chance of playing on Thanksgiving is when they play the NFC North with Detroit in it or the NFC east with Dallas.

Now that they've added a night game it kinda changes things a little though

 

You are misinformed. The Dolphins are not guaranteed a Thanksgiving game every other year. The Cowboys and Lions get the game EVERY year. Their opponents are not predetermined (until the schedule is made, that is).