Kalashtami, also known as Kala Ashtami, is observed monthly during the Ashtami Tithi of Krishna Paksha, when devotees of Lord Bhairav keep fast and worship Him on all Kalashtami days during the year. The most significant Kalashtami si the Kalabhairav Jayanti when Lord Shiva appeared in form of Bhairav. Kalabhairav Jayanti is also known as Bhairav Ashtami.
Lord Bhairava is a fierce manifestation of Shiva associated with annihilation and is sacred to Hindus, Buddhists and Jains alike,worshiped throughout India and Nepal.He is one who destroys fear or one who is beyond fear and protects devotees from dreadful enemies, greed, lust and anger, as they never allow us to seek God within. Another interpretation is that Bhairava is the one who creates, sustains and dissolves the three stages of life. While Time devours all, Kaala Bhairava has tamed Time and dissolves delusion and duality in the mind, making one fearless,dispassionate, aids detachment and grants spiritual progress and liberation. His worship grants relief from debts,paves the way for abundance and welfare of the family.There is nothing more precious than time. Hence intelligent humans should use every moment effectively to progress on the spiritual path and Lord Bhairavas divine help aids this.Lord Kala Bhairava is the guardian of the temple. The vehicle of Lord Kaala Bhairava is the dog. Feeding and taking care of dogs is another way of showing our devotion to Lord Kaala Bhairava.