Final answer:
Canine atopic dermatitis can occur at any age, but is most common in puppyhood and young adulthood.
Step-by-step explanation:
The dog can develop canine atopic dermatitis at any age, but it is most commonly seen in puppyhood and young adulthood. Canine atopic dermatitis is a skin condition that is characterized by itching, redness, and inflammation.
It is caused by an allergic reaction to certain substances in the environment, such as pollen, dust mites, or certain types of food.