When your dog is suffering from respiratory infections, you should take him to a veterinarian for a checkup. This is to rule out more serious problems. A dog with a compromised immune system may develop a life-threatening cold. While the symptoms are not as severe as human respiratory illnesses, they should be treated with caution. It is recommended to limit exercise during cold weather and feed it easily digestible foods. If the cold is persistent, you should prepare a bone broth or use a warm mist humidifier near your dog's bed. Water is important to help your pet recover from a cold.