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.
I know it causes a great deal of discomfort and to your dog the only remedy is to scratch and bite sometimes even chew the skin in an attempt to find relief. Itchy skin in dogs can be a symptom and a result of skin conditions such as bacterial infections, allergies, yeast, or skin parasites for example. Apart from not wanting to see your dog suffer never leave this itching condition untreated because you run the risk of it spreading to other areas of the skin.