Why Your Indoor Cat Turns Aggressive in March: The Spring Hormone Surge Vets Want You to Understand

Why Your Indoor Cat Turns Aggressive in March: The Spring Hormone Surge Vets Want You to Understand

As daylight increases in March, your indoor cat’s body undergoes powerful hormonal shifts that can trigger sudden aggression, redirected attacks, and unpredictable behavior. This isn’t a mystery—it’s biology. Understanding the photoperiod effect on your cat’s reproductive hormones is the first step to managing spring aggression.