Cassandra was the only survivor of her homeworld, and as she was taken in by Dr. Fraiser and began to adapt to her new home on Earth, O'Neill presented her with a dog. He explained to her that it was an Earth rule that every kid has got to have a dog, a rule that Cassandra was happy to obey.
Portrayed by: Boomer*
*Cameo by Boomer: Dog of Make-A-Wish Child, Tara Mitrovic
Cross Reference: Cassandra
Episode Reference: Singularity