Shvana

Shvana, a Sanskrit word meaning a dog, finds repeated references in Vedic and later Hindu mythology, and such references include the following:The female dog of Indra, a Vedic god, is named Sarama, and it is mentioned in the Rigveda. Its offspring became the watchdogs of Yama, Sharvara and Shyama. Yudhishthira, one of the Pandavas, insisted that he be allowed to enter Svarga (heaven) with the dog... (Wikipedia)