The cat who collects the ticks has had a rather sudden change in behavior over the last two months or so. (catster.com)
* If your dog's behavior has changed very suddenly, your first visit should be to your veterinarian, as sudden changes in behavior are often linked to an underlying medical issue. (instinctdogtraining.com)
Signs that something may be amiss include sudden changes in behavior, sleep patterns, elimination patterns, and activity. (consciouscat.net)