I learned a useful tip last week from watching Knitty Gritty that I thought I would share. If you have yarn but aren't sure what size needles to knit your project up on, use a needle gauge. What you do is take 2 strands of the yarn you want to use and pull them through the holes of the needle gauge. Whichever hole both strands pull through the easiest is the size of needle you want to use. I tried this on the Chihuahua sweater and the results were fantastic!