Some canine influenza symptoms are sneezing, coughing, fever, lethargy and loss of appetite, claims the American Society for the Prevention of Cruelty to Animals. The dog may have a fever, breathe rapidly or with difficulty, and have a nasal discharge that is at first clear and then becomes thick and yellow-green.
Canine influenza is a viral type of kennel cough, says the ASPCA. It is one of the infections that are spread among dogs kenneled together. The dogs need to be close together for the virus to spread because the virus itself doesn't live long in the open air.
Though death from canine influenza is rare, it is important that it be treated before it progresses to an even more serious illness such as pneumonia, says the ASPCA. Though there's no vaccine against canine influenza, the dog should recover if he is taken away from other dogs and allowed to rest in a place that is quiet and comfortable. He needs to eat nutritious foods, may need supplements to support his immune system, and may even need intravenous fluids to keep him hydrated. If he has pneumonia or another secondary infection, he may need medicines such as antibiotics. Most otherwise healthy dogs recover from the flu in 10 to 30 days.