The individual Domestic Shorthair matters more than the label
A Domestic Shorthair can live happily with other pets, but the label tells you less than the cat in front of you does. Domestic Shorthair is a mixed-heritage description, not a standardized breed temperament, so one may be a bold, dog-raised cat who treats every species as furniture, while another, rescued as an adult, may find a barking housemate genuinely frightening for months. Before adding any animal, take stock of the actual cat: how she reacted to visitors' dogs, whether she chose fight or flight at the shelter, and whether she shares space with neighborhood cats at the window or guards it. A shelter or rescue can often tell you if a particular cat was surrendered from a multi-pet home, which is real evidence rather than guesswork. Match the new housemate to that history, not to an average.
Pairing a Domestic Shorthair with a dog
Most Domestic Shorthair and dog pairings succeed when the dog's behavior is managed first. Choose or prepare a dog who can hold a calm settle near a cat, redirect from staring and lunging, and accept that the cat may never want contact, only coexistence. The cat needs the architecture of escape: baby gates she can clear and the dog cannot, high perches in shared rooms, and at least one dog-free room where her food, water, and litter live permanently. Early meetings should be short and boring by design: the dog leashed and rewarded for ignoring the cat, the cat free to leave at any moment. Chasing is the line that resets progress, because a Shorthair who has been chased remembers it long after the dog has forgotten, so interrupt arousal early rather than testing whether it fades on its own.
Other cats, and the small-pet rule that never bends
With a second cat, a Domestic Shorthair's odds improve when ages and tempos roughly match and when the home does not force competition. Feed in separate spots at first, keep one more litter box than there are cats, and duplicate the best window perch or be ready for quiet guarding of it. Slow scent-based introductions matter more than the cats' first impressions of each other through a carrier door. Small pets follow a stricter rule: rabbits, guinea pigs, hamsters, birds, and reptiles live in enclosures a Shorthair cannot open, tip, or reach into, ideally in a room with a door that stays shut when nobody is present. Even a lazy, well-fed indoor cat retains a complete hunting sequence, and a fluttering or darting animal can switch it on in a second.
Reading whether the mixed household is actually working
Judge a Domestic Shorthair's mixed home by ordinary days, not by one cute photograph of shared furniture. Working looks like the cat using the whole house again, eating near normal times, greeting you as before, and choosing to be in shared rooms when she could be elsewhere. Not working looks like a cat who has quietly shrunk her life to one room, started over-grooming, or begun skipping meals and litter visits because a housemate blocks the route. Those patterns call for stepping introductions back a stage and adding resources, not for waiting in hope. Give genuine adjustment at least several weeks, and if a resident animal's wellbeing keeps declining, a vet or qualified behavior professional can help you judge whether the match itself is the problem. Noting each pet's reactions and the stage you have reached in KinsLe with Family Sharing means the person who was not home for a bad moment still works from the same facts.