Outside the glass, placement does the work
White cloud mountain minnows can live in a home with cats, dogs, and other pets quite successfully, because the safety questions are about the tank rather than the minnows' temperament. A white cloud tank needs a solid stand a dog cannot jostle, a lid a cat cannot lift or sit through, and a spot out of the path of wagging tails and thrown toys. Cats are the most persistent risk, since a school of flashing white clouds is exactly the moving display that holds a cat's attention for hours. Give the cat a perch nearby that is not the lid, and most cats settle for watching.
Inside the water, size decides compatibility
Within the aquarium, white cloud mountain minnows are peaceful schoolmates for other small, calm fish that share their preference for cooler water. They neither nip nor bully, and their confidence in a group of six or more keeps them swimming openly around tankmates. The danger runs the other way: larger fish with big mouths, including many popular community centrepieces, will eat white clouds, which at about an inch and a half are snack-sized for a surprising number of species. Check adult size and mouth size of any proposed tankmate, not just its reputation for peacefulness, before it joins the minnows.
Birds, reptiles, and small mammals in the same home
White cloud mountain minnows are unaffected by most other household pets as long as nothing shares their water or can reach into it. Keep the tank away from a free-flying bird's favourite landing spots, secure electrical leads where a chewing rabbit or rodent cannot reach them, and never house minnows in an open bowl-style setup in a multi-pet home. Open water invites drinking, dipping paws, and contamination from litter dust or grooming products carried on fur. A closed, lidded aquarium removes nearly all of those cross-pet risks in one decision.
Introducing a new pet to a home with minnows
Bringing home a new cat or puppy calls for a short period of treating the white cloud tank as off-limits territory while the newcomer learns the house rules. Block access to the room or use a barrier until you have seen the new pet notice the school, react, and lose interest under supervision. Puppies need the stand itself made boring, since chewing cables and bumping furniture are bigger early risks than interest in the fish. Once the routine settles, most households find the minnows become background furniture to other pets rather than a fixation, with even a keen young cat usually downgrading the school to an occasional glance within a few weeks.
One set of house rules, known to everyone
Multi-pet homes run on consistency, and the minnow tank's rules only work when children, guests, and pet sitters all hear the same version: lid stays on, nobody feeds without checking, and the tank room door stays shut if that is the arrangement. Writing those rules into KinsLe Family Sharing puts the white cloud mountain minnows' care details in front of every family member who helps, instead of relying on whoever set the tank up to repeat them.