Harriet has the wrong glasses on and can't tell which horse is which.

Move your mouse over the horses and help Harriet put each horse in the right stable. The appaloosa goes in stable 1, the dapple grey goes in stable 2, the palomino goes in stable 3, the brown goes in stable 4, the skewbald goes in stable 5. Above each horse, type in which number stable he should go in.