Dog bronchitis usually affects small to medium-sized breeds that are over one year of age. The causes of dog bronchitis are not always known. However, researchers say that cigarette smoke and urban pollution could be one of the causes that lead to bronchitis. The overpowered immune system of a dog with frequent viral or bacterial infection is most of the time unwilling to protect the dog from such infection. Therefore symptoms such as wheezing, loss of appetite, frequent gagging and sometimes fe...
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