Summon Caniforms is a monster-only spell which summons 1-5 of the following forest-related animals:
h Black bear(31.6%)
U Grizzly bear(15.8%)
Although none of these monsters are terribly dangerous on their own, they can prove a costly distraction while the caster hits you with its more dangerous spells, especially if they manage to pin you down adjacent to several animated trees.
Summon Caniforms was removed in 0.13, when the only monster that could cast it (spriggan druids) had their spell list updated.