How do the Durable and Dwarven Fortitude feats interact?
While the Durable feat (PHB, p. 166) states that you gain a minimum of double your Constitution modifier from using your Hit Dice to heal, the Dwarven Fortitude feat (XGtE, p. 74) has you regain Hit Points equal to what you roll, plus your Constitution Modifier, whenever you take the Dodge Action.
Since the Dwarven Fortitude feat has a more specific rule in regards to healing with Hit Dice, I was curious whether the two actually worked together properly.
Best Answer
You would heal at least the minimum amount that Durable grants while using Dwarven Fortitude.
The Durable feat says (PHB, p. 166):
While the Dwarven Fortitude racial feat says (XGtE, p. 74; emphasis mine):
Because DF says you roll the spent Hit Die, it counts as rolling a Hit Die to regain points, so Durable would apply.