Potential Risks
Betta fish are generally not harmful to cats, but a few risks exist:
Ingestion: A curious cat might try to eat the fish, creating a choking hazard or digestive issues for the cat and endangering the fish.
Water contamination: A knocked-over tank creates slip hazards, and water contaminated with waste or medication could harm a cat if ingested.
Fish stress: A cat's presence near the tank can stress the betta, potentially causing health problems.
Prevention
Secure the tank on a high shelf or behind a barrier. Supervise interactions, use a secure lid, and train your cat to avoid the tank with positive reinforcement.
With precautions, betta fish and cats can coexist safely.