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.
This is the most common cause of itchy skin disease in dogs. Signs of fleas include flea dirt which looks like black flecks through the coat as you part the hair and fleas themselves. If your dog is scratching its back and the base of the tail, it is probably a flea allergy. Mange can cause your dog to be itchy.