Restless or more vocal than usual
Loud yowling, crying, or meowing
Rolling on the floor
Rubbing against people, furniture, or walls
Increased affection or clinginess
Raised hindquarters when petted
Tail held to one side
Frequent attempts to escape outside
Pacing or agitation
Decreased appetite
Licking the genital area more often
Assuming mating posture
Signs starting around 4 to 12 months of age
Repeating these signs every few weeks if not spayed