Early stage:
* Fever
* Lethargy
* Loss of appetite
* Vomiting
* Diarrhea
* Coughing
* Sneezing
* Watery eyes
* Nasal discharge
Middle stage:
* Neurological symptoms, such as:
* Seizures
* Head tilt
* Circling
* Paralysis
* Skin problems, such as:
* Rash
* Pustules
* Ulcers
Late stage:
* Pneumonia
* Encephalitis
* Death
It is important to note that not all dogs will experience all of these signs. If your dog is showing any of these signs, it is important to take them to the vet immediately.