During voluntary workouts, Dwyer, who starred at Georgia Tech, made several impressive runs and looked like a potential backup to starter Rashard Mendenhall.
Once training camp began, Dwyer looked like a different player -- out of sorts, and perhaps, even a little out of shape.
Dwyer said he arrived to camp in good shape, although hamstring injuries, especially with a rookie, can indicate a lack of conditioning.
"I felt like I did enough, but being hurt is a setback for anybody,'' Dwyer said. "I'm just trying to get back in shape. This is a learning experience for me how to take care of my body better, to realize what it takes to become a professional.
"Everybody goes through trials and tribulations in their lives. This will make me stronger. It's not about getting through each day. It's about doing your best each day and figure out what you did wrong and improving the next day.''