Ame is an hellhound like Pluto,and his mate.
Her name was given by Shota,it means "Candy" something that the little boy really loves.
Even if she is very quiet and serious she really loves Ciel and his kids,that for her are like puppies,but she hates Sebastian that she always try to chew,both in wolf form and both in human form.
Unlike Pluto,that can't do that very well,she speaks the human language but she talks only when she want to annoy Sebastian.
Ame's face reference: [link]
Wolf base: [link]