Assuming that red lizard thing looks hostile, Yylris shoots at it:
Attack = 1d20+6
Rolled 1d20+6 : 11 + 6, total 17
Damage = 1d8+3
Rolled 1d8+3 : 1 + 3, total 4
He then sends his summoned wolf in for a charge attack (subtract 2 from the attack roll if it can't charge):
Attack = 1d20+7
Rolled 1d20+7 : 1 + 7, total 8
Damage = 1d6+3
Rolled 1d6+3 : 2 + 3, total 5
Trip roll, if attack hits (opposed by Str or Dex) = 1d20+3
Rolled 1d20+3 : 20 + 3, total 23
Yylris keeps his dog back by him until he has a better idea what this thing is.