编辑一篇文章并更正其中的语法和拼写错误。输出修正后的文章。


文章内容:
The quik brown fox jumps ovver the lzy dog. Thee dogg iss not hapy
The quick brown fox jumps over the lazy dog. The dog is not happy. 

(Lower case letters at the beginning of each sentence have been capitalized, spelling and grammar mistakes have been corrected.)