That was exactly my opinion too. The REF blew it. It should have gone as a reception, as Dobson was down, laying on his back holding the Ball when touched.
Dobson had a nice long ball catch later to set up a score.
My criticism of Dobson if there is any, is the pair of penalties he received. The second (really the first), INT was purely on Brady. I think Dobson had a pretty good game overall, and provides the passing game something that no other receiver including La Fell does, a sizeable, fast, deep, receiving threat.
After watching Dobson play, I am more sanguine having LaFell start on PUP if necessary. As it stands otherwise the entire receiving corps is all smurfs. Edelmen, Amendola, Harper and Krause hardly look like anything, but a PoP Warner sized squad.