How many animal companions can a pack lord druid have? Can't seem to find rules limiting it, but it is phrased to make me think two is the limit.
Two is not the limit. Your Druid level is your effective limit, since you can always allot your new Druid level into a level one animal companion.
The real question is at higher levels to make these twenty or so Wolfs, Raptors, Bears, Hawks useful. Scouting with flying animal companions in a settling where you know little to nothing about the area is always nice. However I'm getting off topic. You can have as many as your Druid level.