我隻狗食完牆之後就嘔，點解？？？

消化唔到故嘔番出黎
中左油漆內既毒素
點解你仲比佢食??好危險 ka wor. 佢可能當玩下．唔識 ka ma.你要教佢，或唔好再比佢接近個道牆啦．如果真係好難阻止，或要返工冇人理到佢．就去大型寵物台買支噴霧．噴左之後會好似有條隱形防線咁 ka. 貓狗就唔會行入去 ka lak.　

It is reasonable to your dog to vomit when dog ate something that shouldn't be eaten.
I don't know why your dog is eat the wall, as you didn't give much information about this. I could recommand you to notice, is he borad? or any thing has change recently? You might able to find out why your dog eat the wall?