Each 100 mg BOSULIF tablet contains 103.40 mg of bosutinib monohydrate, equivalent to 100 mg of bosutinib; each 500 mg BOSULIF tablet contains 516.98 mg of bosutinib monohydrate, equivalent to 500 mg of bosutinib.
Having said that, If your dog is itching and scratching all year long, then it's most likely due to either a food allergy or an allergy to something that is present all year such as dust mites or possibly even mange. In either case, you'll probably need more help to determine the cause which you can find here.
Dogs often shake if their skin is irritated or itchy. Unlike humans, dogs cannot always reach to scratch any itchy or ticklish areas of their bodies. A dachshund, for example, cannot reach any area along its long back with a paw. So, you might see a dog shaking from side to side as a way of trying to stop itchiness.