"On the sea, on the ocean, on the island, on Bujan. On empty pasture gleams the moon, on the ashstock lying in a green wood, in a gloomy vale. Toward the stock wandereth a (shaggy wolf). Horned cattle seeking for his (sharp white fangs). But the (wolf) enters not the forest. But the (wolf) dives not into the shadowy vale. Moon, moon, gold-horned moon, check the flight of bullets, blunt the hunters knives. Break the shepherd's cudgels. Cast wild fear upon all cattle, on men, all creeping things, that they may not catch the (grey wolf). That they may not rend his warm skin! My word is binding, more binding than sleep, more binding than the promise of a hero!"
When the spell is complete, he springs thrice over the tree and runs into the forest, transformed into a (wolf)
Note: the words in parentheses can be altered to alter the shapeshifting into a different animal.