Venomancers are best known as a pet tamer class in Perfect World. Here's all the info on pets that you want to know. There are several pets to you choose.
Golem: High physical defense, decent magical defense, high hp, high attack. Great as a tank and is used by virtually every Venomancer. There is a bit of debate over whether it's better to get the level 17 Molten Lava Crystal or the level 18 Fiery lava Rime, both of which can be caught near Ground of Logging (who knows what it'll be changed to in this version) by Etherblade city.. The stat difference Perfect World Gold is extremely small with the Molten Lava Crystal having a slight advantage over the Rime in stats, but the Rime starts off with the skill crustaceous, which is useful for a tank. Basically, if you wish to save a bit of money pick the Rime, otherwise the Crystal has better stats.
Sawfly: Decent magical / physical Perfect World Gold defense, low hp, high attack.. Great as a pk pet for the high attack and the ability to fly. Used by a large majority of Venomancers for pk'ing. The lowest level of these is the level 8 Petite Sawfly by Bamboo Village.
Aquabarrier Dharma: A rare pet that spawns every 12 hours. Fairly low physical defense, decent magic defense, decent hp, low attack. Useful as a pk pet due to it's extremely fast speed and it's starting skill of level 4 ripping bite, but really shines in HH / FB when luring from a large group of mobs is necessary.
Frog: The little frog is another rare pet that spawns every 12 hours. High phys defense, high magic defense, good hp, low attack. Venomancers that decide Perfect World Gold they need a magic tank use these for bosses with high magic attack that a golem simply can't live through at the same level, such as Styxserpent in id69.
Flying pig: Yet another 12 hour spawn pet. High physical defense, high magic defense, high hp, low attack. Very good as an air tank, although hardly ever used, as tanks are really only needed in dungeons which only allow ground pets, and the low attack of the pig make it a pain to level.