Carolina Panthers running back Chuba Hubbard (calf) sat out his second straight practice on Thursday, putting his status for Sunday’s home game against the Miami Dolphins in doubt. Hubbard, 26, also dealt with the calf issue last week but totaled 69 yards from scrimmage on 13 touches in last Sunday’s loss at the New England Patriots. However, he did see a season-low 51 percent snap share as backup Rico Dowdle rushed for 32 yards on nine carries. Overall, Hubbard has 3,392 rushing yards and 22 touchdowns on 808 carries along with 134 receptions, 843 receiving yards and four scores in 68 games (43 starts). Third-string rookie Trevor Etienne has seen limited action, accumulating 33 yards on seven carries last Sunday and 37 yards on eight carries overall in four games.