A waiting period in pet insurance refers to the time you must wait after purchasing a policy before coverage begins for certain types of care. You'll pay your monthly premiums like usual, but you won't be able to file claims for covered services until the waiting period ends. Most insurers use waiting periods to prevent pet owners from buying insurance only after their pet gets sick or injured.
Waiting periods are different from pre-existing condition exclusions. Pre-existing conditions are health issues your pet had before coverage started, and these are typically excluded from coverage permanently, regardless of waiting periods.