Small pairs are defined as 7-7,6-6, 5-5,4-4, 3-3, and 2-2. Most low-limit hold 'em players play small pairs very poorly. Most low-limit players play all pocket pairs in all situations. The dream of flopping a set and winning a huge pot is just too tempting. Do not fall into this trap!
Obviously there are very few hands that you will dominate with your small pair. What are you hoping your opponent holds? A pair smaller than yours? A-2s? What if you have several opponents? You are a negligible favorite over two bigger cards, but you are a huge dog to a bigger pair. Herein lies the problem with small pair. You are either a negligible favorite or a huge dog.
There are two ways for your small pair to win. First, all of your opponents could miss their hands and you could win without improving. Second, you could improve to a set, straight, flush, full house, quads, or a straight flush and beat a hand which would otherwise beat your pair.