Not feeding your pet dog for a long period of time can have serious negative effects on its health and behavior. Here are some possible observations: 1. **Weight loss**: Dogs will lose weight rapidly and may become emaciated. 2. **Lack of energy**: Dogs will appear listless and lack energy, and may become lazy and even unwilling to move. 3. **Malnutrition**: The coat may become rough and dull, the skin condition may deteriorate, and even hair loss may occur. 4. **Behavioral changes**: Dogs may become anxious, irritable, or aggressive because the stress and discomfort caused by hunger may affect their behavior. 5. **Digestive problems**: Digestive problems such as vomiting, diarrhea, or constipation may occur. 6. **Decreased immunity**: Long-term nutritional deficiencies can weaken the immune system, making dogs more susceptible to illness and infection. 7. **Risk of dehydration**: If there is a lack of water replenishment at the same time, dogs may face serious risks of dehydration. 8. **Organ failure**: In extreme cases, long-term starvation can cause damage to important organs such as the liver and kidneys, and even lead to multiple organ failure. 9. **Depression**: Dogs may become depressed or show signs such as being unwilling to interact with people or no longer interested in their surroundings. Ensuring that your pet dog is properly fed and supplemented is essential to maintaining its health and well-being. If you have any questions about feeding, it is recommended to consult a veterinarian for professional guidance.