Countershape

You attempt to interrupt a creature in the process of assuming a Wild Shape. If the creature is becoming a creature of CR 3 or lower, its Wild Shape fails and it remains in its current form. If it is becoming a creature of CR 4 or higher, make an ability check using your spellcasting ability. The DC equals 10 + the creature's CR. On a success, the creature's Wild Shape fails and it remains in its current form.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the interrupted Wild Shape has no effect if its CR is less than or equal to the level of the spell slot you used.