Meaning of ferocious

As Mr Andrews was about to leave he found a note pinned to his door. It was from Mary Smith advising him to be careful because she has just bought a ferocious young guard dog.

Ganesh,

This is a forum for announcing and welcoming new members, not for posting questions.

I’ve noticed you repeatedly post your questions here instead of in the correct forums, which not only results in extra work for the moderators, but results in delays to your questions.

Would you please post your questions about vocabulary, grammar, and idioms in the
English Grammar, Vocabulary, and Idioms forum?

Once you begin posting your questions in the correct spot, people are more likely to answer them.