When you're done with that sweater, there's an order in the way you should sew it together. It's sew the shoulder seams. Add the collar, if the directions don't tell you otherwise. Sew the sleeves into the armholes. Seam the entire thing up from the ends of the sleeves, under the armholes, and down the sides of the sweater. An alternate way would be to sew shoulder seams, sew side seams, sew sleeve seam, and sew sleeve top into armholes. But that's a more difficult way. The first way is easier. I used to sew all my children's clothes when they were little so that's the standard order to construct a garment.
Welsh corgis are cool.