There are five mistakes involving a/an in this text.

a   Rewrite the text using the correct form.

Charlotte has got a adorable puppy called Millie. Millie is an yellow Labrador. Yesterday Charlotte and Millie went for a incredibly long walk in the woods. Millie found a old shoe under some bushes. While they were walking, it started to rain and they both got wet. When they got home, Charlotte dried Millie with an fluffy orange towel.