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.
Itchy Pekingese - Itching Scratching Series. The Pekingese quite commonly gets allergic skin disease from food allergy or canine atopic dermatitis. This can lead to itching, scratching, chewing and licking which in turn can lead to secondary skin infection with bacteria or yeast. The common skin infection in the dog is caused by Staphylococcus intermedius.