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.
Guard your dog against the many diseases that fleas carry and transmit. You may think that these tiny pests only make your pet do a little scratching and itching, but fleas actually cause a number of diseases, some of which can be fatal. By not protecting your pets from fleas, you are exposing them and yourself to severe health risks.