Pets are NPCs and their size is specified in the npc_types table. Just summon a pet and target it then type "#npcstats" to get the npc id, the do a query based on that ID and you'll find that particular pet. Each pet has many npc entires - one for each level of pet. Once you figure out which npc type is your pet, you can do another select and see all of them at once.
I found the shaman wolf size pretty decent at 3 - the default 7 was humongous!
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