Answer:
Though desert men once called me God, today men call me mad. For I wag my tail when I am angry. And growl when I am glad.
What jumps when it walks & sits when it stand?
Dark, feathery, and popular in Baltimore and fantasy books.
I am known for my beautiful mane and people ride on my back. What am I?
When it was young, it had a tail. When it grew up, it had knees
What language does a billboard speak?