Slushy is Calypso's service dog. She is a Siberian husky specially trained to guard and guide Calypso around when they're going out. Slushy was a Christmas gift from Fenrir. She is commonly seen wearing a black harness with a blue vest, indicating that she is at work. At home, the vest is off and she serves as her owner's playful pal.

She is attentive to following Calypso's commands and executing them when traveling around. She makes sure Calypso is safe and does not cause disturbances with other people and animals. Slushy still enjoys giving kisses to strangers who caught their attention to her. Once the harness is off, her true personality springs into action. Slushy is very social with everyone, making her the perfect playmate. She loves to run, fetch, hide toys, and "talk" to others. She grows more noisy and sassy than usual when people talk back to her, responding with barks, howls, and head tilts. Slushy has a close bond with Calypso, showering love to them daily and comforts them when agitated.