Lethargic, dry nose, not eating, drinks little, keeps lying down, vomited once with white foam

Hello. Based on your description, the dog’s symptoms of lethargy, dry nose, crawling, and vomiting indicate the dog is sick; it is recommended to take it to a veterinary clinic for examination promptly, confirm the cause, and adopt appropriate treatment measures.

It is recommended to focus on ruling out canine distemper infection. If the dog is infected with the distemper virus, it needs timely antiviral treatment with interferon, monoclonal antibodies, and the like. At the same time, give the dog an appropriate amount of oral antibiotics to prevent secondary infection, as well as symptomatic treatment.