When a dog is sick and has no appetite, it is important to feed them nutritious food to help them recover. Here are some foods that can be given to a sick dog with no appetite:

• Cooked, plain white meat such as chicken or turkey, as it is easily digestible and low in fat.
• Fish, such as cod, which has a strong smell that can help encourage the dog to eat more food. Fish also contains healthy fats and vitamins that can strengthen the dogs immune system.
• Bland foods such as boiled chicken, white rice, sweet potato, pumpkin, bone broth, and scrambled or hard-boiled eggs.

It is important to avoid feeding a sick dog foods that are high in fat, spicy, or contain ingredients that can be toxic to dogs, such as garlic powder or onion powder. If a dog has not eaten anything for 24 to 48 hours, it is important to get them checked by a vet, especially if they are a puppy, have not had anything to drink, or have other symptoms.