Do girl dogs feel sick when they bleed the first time?

When female dogs go into heat for the first time, they may experience some discomfort or mild cramping, but they generally do not feel sick in the same way humans do. Their behavior can change slightly, as they may be more irritable or restless, but these symptoms vary among individual dogs. If a dog shows signs of severe pain or illness during this time, it's important to consult a veterinarian to rule out any underlying health issues.