Janmeya's brothers get a curse for mistreating a dog during the yajna

Abhimanyu, the son of Arjun, had a son called Parikshit. Parikshit was killed when a poisonous snake bit him. So Parikshit's son Janmejaya organised a Yajna in which he vowed to burn all the snakes. The Yajna was to be organised with the help of his brothers in the fields of Kurukshetra. Janmejaya had three brothers called Shrutsen, Ugrasen and Bhimsen. While they were performing the rituals (Puja) a stray dog wandered into the sacred area where the holy offerings were kept. The brothers hit the dog with sticks to drive it away and the dog ran squealing to his mother. The mother consoled her puppy and said that he must have done something to provoke the anger of the brothers. The dog defended himself by saying that he was not at fault and that he had neither licked any of the offerings, nor even looked at them. The dog's mother Sarna, who belonged to the Gods felt very angry and hurt at the brother's treatment of her son. She went to the Yajna place and asked the brothers of Janmejaya why they had thrashed her son without any fault. When no one answered her she became really angry and cursed them, "You have punished my son without any reason, therefore I curse you that there shall be some sudden fear that will engulf you." Thus cursing she went away from there. Janmejaya's brothers were saddened by this unexpected turn of events. After the rites of the Yajna were performed, they went to Hastinapur and looked for a priest who would rid them of the curse. One day they went hunting. While wandering in the forest they came across a hermitage belonging to a saint named Shrutshrava. The saint had a son called Somshrava. Janmejaya decided to appoint Somshrava as his personal priest and requested Shrutshrava to allow him to accompany them and get them rid of their curse. Shrutshrava said, "My son is a great ascetic and scholar. He will help you get rid of the curse, but he cannot undo any curse given by Shiva. He has also made a secret vow to grant any wish of a brahmin. If you can get him to agree to accompany you then you are welcome to appoint him as your priest." Janmejaya requested Somshrava to accompany him to Hastinapur. When they reached Hastinapur he told his brothers to do exactly as the priest told them to do and never disobey him. The brothers did as they were told and the priest helped them get rid of their curse. Later they even invaded Takshila and won it.