Do dogs get bored eating the same food every day?

We have no reasons to believe that boredom with food play any part in a dog's appetite.

Many dogs that are fed the same dry dog food for years are happy and active. Some foods are more palatable than others and naturally they will be preferred.

When you add meat scraps to a nutritionally balanced dry food diet occasionally, the dog may refuse to eat its normal diet for a day or two thereafter. This is the dog's way of telling you it prefers the taste of scraps. The dog doesn't know that the scraps do not contain balanced nutrition.

The key is to find a dog food that is palatable and nutritious and stay with it.