Hot Cat
The Hot Cat (JP: ホットキャット) is a consumable item in Undertale. It is sold by Sans in his hot dog stand in Hotland only if Papyrus is alive. The Hot Cat is obtained the second time the protagonist buys an item from the hot dog stand, replacing the Hot Dog...?, but only one Hot Cat can ever be obtained.
Compared to the Hot Dog, it heals for one more HP, makes a meowing noise when eaten (unless in Serious Mode), and cannot be exchanged for a Hush Puppy. It also sells for 1G more than Hot Dogs.
If the protagonist has a Hot Cat, they attempt to slide it through the rightmost door in the MTT Resort, only to have it rejected. This means that, even if they have a Hot Dog in the inventory at the same time, they cannot receive the Hush Puppy from the door until they discard the Hot Cat. This property is shared with Dog Residue and Dog Salad.