Number 4 : sudden aggression.

Your formerly affectionate little friend has suddenly become.. ..aggressive? Are you sure you never pushed it or kicked it, and now it’s getting its fair share of revenge? If you have been loving and kind to your pet, then the reason for such an unfair response may be the pain. Dental issues, arthritis, injuries, infections. These are just a few conditions that may alter a pet’s mood and cause it pain.