Canine influenza, or dog flu, presents symptoms similar to human influenza. Common signs include coughing, nasal discharge, fever, lethargy, and reduced appetite. Coughing is the most prevalent symptom and can persist. However, it's important to note that not all dogs with the flu will exhibit symptoms, and the severity can vary. Some recover in a few days, while others stay ill for weeks. In rare cases, it can be fatal, with senior dogs and those with underlying health issues at the highest risk. If you suspect your dog has the flu, consult your veterinarian for guidance on care and monitoring.