拉肚子问题引起的原因很多，请看普渡大学的帖子。皮屑问题，不知道狗狗的皮肤是否有红肿和异味？

米卡妈的帖子基本涵盖了如何调理狗狗的肚子

这是普渡大学关于狗狗拉肚子的原因和对策

www.vet.purdue.edu/vth/sacp/documents/TreatmentofDietaryIndiscretionintheDog.pdf

皮屑的问题，是很干燥的皮屑还是油腻的？如果是油腻的，可能是脂溢性皮炎
www.uhs.umich.edu/dandruff

loudoun.nvcc.edu/vetonline/vet211/skin%20dx.htm
SEBORRHEA

Seborrhea is a skin disease in dogs caused by a defect in keratinization of the skin cell layers. There is a build up of scale and sebum that results in a greasy dandruff appearance to the skin and hair. Often there is inflammation and infection associated with it, and a characteristic odor is often noted.

不要经常给狗狗洗澡，我家丘丘的毛跟金毛一样多，大约2个月或3个月洗一次，但是一定要至少一周梳透一次