Which CCD sign relates to daily rhythm and sleep-wake patterns?

• A. Altered sleep-wake cycles
• B. Increased energy
• C. Vocalization at night
• D. Shivering

Answer: (A)

The main idea is that canine cognitive dysfunction often disrupts the dog’s internal clock, changing when they sleep and when they’re awake. In affected aging dogs, the day-night routine shifts, with more activity or rest at the wrong times. Altered sleep-wake cycles directly describes this disruption to the daily rhythm, making it the most precise choice. While vocalizing at night can be a sign that comes from sleep disturbance, and shivering or a general increase in energy are not specifically tied to the daily rhythm, they don’t pinpoint the circadian disruption as clearly.