Westie by Jordan

Hey, I'm having trouble making the Westie happy in its exhibit. Is there anything in the code that makes it so hard to please?

Number of animals allowed per exhibit: 2-8 with 10 squares for each adult.

Exhibit size (for 2 adults): 20 grid squares

Terrain (for exhibit with 20 grid squares):
 16 Coniferous Floor, 1 Dirt, 1 Fresh Water, 2 Grass

Foliage (for exhibit with 20 grid squares):
 1 grid square should contain foliage.
 Foliage that would give the most happiness: Yew Tree
 Since this is a small plant, greatest happiness will occur
 if the grid square contains 4 of this plant.

Rocks (for exhibit with 20 grid squares):
 2 Small Snowy Rock - Small, which is its most liked rock.

Elevation: Of the 20 squares, 1 nonadjacent squares should be elevated.