The 3 main ingredients that cause skin allergies and stomach issues in dogs are beef, corn and wheat.
Remove these three ingredients from your dogs diet and you will see a vast improvement.
Feed only Quality grain free dog foods like MFM, Ivory Coat, Taste of the wild ect or fresh meats but avoid the three ingredients listed above. Also no processed treats like schmackos or dentastix. Use fresh or smoked real bones - but not beef.
