There may be several reasons why dogs like biscuits:
Good taste: Many biscuits have a good taste, and dogs may also like that taste.
Commonly used in training: When training dogs, many people use small biscuits as rewards. Therefore, dogs may associate eating cookies with receiving a reward.
Sensory stimulation: Dogs like to chew things, and the crispy texture of biscuits can provide sensory stimulation for dogs to chew.
Comfort: Dogs may also eat biscuits because they feel they are being comforted. Sometimes, dogs may eat biscuits because they feel uncomfortable or anxious. Eating biscuits can bring them some happiness and comfort.
In short, there may be many reasons why dogs like to eat biscuits, but no matter what the reason is, there is no harm in dogs eating biscuits.