I like the creepy-crawlies. As soon as my hunter hit Level 15, I made my way to the Skittering Dark in Silverpine Forest and hunted down Krethis Shadowspinner. Sure, she looked exactly like the low-level spiders in Tirisfal Glades, but how could I not want her? With a name like that, she was sure to be deadly. Sure enough, she was, and she managed to kill me several times before I was finally able to tame her. If I had waited 5 more levels, Freezing Trap would've made things much easier.
Of course, over the course of leveling, I had to abandon her (leveling pets was nowhere near as easy as it is post-Patch 3.0.2) but these days I keep the company of Leech Widow from the Wetlands. Yes, it's a generic white spider, but you'll understand these things if you have a Hunter. The cool thing is, Spiders now appropriately have the Web ability that we only used to envy from NPCs. It entraps opponents for 4 seconds from 20 yards and has a 40 second cooldown. It's a damage-less version of the Exotic Pet Silithid's Venom Web Spray. The good news is, the damage doesn't really matter. You'll want to use the web merely to keep opponents at a distance. This ability makes them a great choice for Level 19 twinks.