This pattern assumes you know how to knit in the round (using your favourite method, be it DPN, two circulars or magic loop), purl, increase (kfb, kfbf), decrease (k2tog, k3tog), and long tail cast on. I used DK but you could use any yarn, just upsize (or downsize, if you're a masochist) the needles appropriately.
Round 8: Knit 2 sts, make bobble (ear), knit 3 sts, make bobble (ear), knit 11 sts
Follow the pattern as above until the end of round 14. Then:
Baby Pig for Piggybacking Purposes (OK, I think this is the smallest I can make pigs)