Sentence:  Why ſhould thoſe "Eteſian" and Eaſterne winds blow cōtinually in ſome places, at ſet times, one way ſtill, in the <WSD>dog dayes</WSD> only: heere perpetuall drought, there dropping ſhowres; [...] 
Meaning of the word marked with <WSD> tags:  The unpleasantly hot days of late summer.