In the FilmEdit
Phil was initially the only one accompanying Gobber on his quest to catch the Boneknapper. Like most of the sheep around Berk, Phil does not appear to be very intelligent. Although he is smart enough to follow Gobber's orders, he has a further sense for his own self-preservation (moving out of the way while Gobber was looking for "Dragon Bait" and trapping the Vikings in the ribcage so the Boneknapper would be more occupied with them) than anyone else.
In addition, Phil has a rather dry sense of humour, as when Ruffnut says on the way to the island, "So, if we don't hear anything, we're dead?" he breaks the silence by bleating loudly enough to make all the Vikings jump.