Final answer:
Cats and small dogs are generally considered geriatric at the age of 10 years option (c), marking a stage where their care needs may change.
Step-by-step explanation:
The age at which cats and small dogs are generally considered geriatric is c) 10 years. As pets reach this stage in their lives, their dietary, activity, and healthcare needs may change. It's important for pet owners to be aware of these changes to ensure they give their geriatric pets the care that they require.
As they age, these animals may experience age-related changes in their health and may require special attention, care, and veterinary considerations tailored to their geriatric status. Regular veterinary check-ups become particularly important to monitor and address any potential health issues associated with aging.