It was a coyote howling at the moon.
Coyotes are a wild member of the dog family.
They are known for their eerie howl heard mostly at night but sometimes in the morning. It is said that they howl at the moon, but I think they howl to communicate with each other. Coyotes first mate when they are two years old. They are born blind and open their eyes when they are two weeks old. A newborn coyote weighs about seven to ten ounces.