What are the bumps on the dog that have hard white stuff when squeezed?

The bumps on a dog that have hard white material when squeezed are likely sebaceous cysts or impacted hair follicles. These cysts are filled with keratin, a protein found in skin, and are generally benign. However, it's important to consult a veterinarian for proper diagnosis and treatment, as they can sometimes become infected or may indicate other underlying health issues. Regular veterinary check-ups can help monitor any changes in your dog's skin condition.