Unlike ghost Sims, ghost pets can't haunt objects or scare other Sims. Ghost pets also play with each other if they had a good relationship when they were both alive. If both the owner and the pet are ghosts, the owner will pet it and/or play fetch if it's a dog. If University is installed, a pet can be brought back to life with the Resurrect-O-Nomitron. More often than not, a Sim may spot a beloved pet floating around the house at odd hours, though the Prima Guide for The Sims 2: Pets states that ghost pets will only interact with other ghosts.

In The Sims 2: Pets, dogs and cats can only die of old age, and their ghosts are white. As with the ghosts of human Sims in the original game, ghost pets in Unleashed will be green regardless of their cause of death. When dogs or cats die, their gravestones will be different from those of human Sims, and their ghosts will appear occasionally. In Unleashed, unlike later games, pets can starve and die in fires. In The Sims: Unleashed, dogs and cats, like Sims, do not age and have indefinite lifespans.

Sims 3 pets ghost hunting