It's seems like it's an annual topic, coming up every August as the weather gets hot and humid.
"The Dog Days are Here"... or similar expression marking to arrival of heat in the MOV.
The expression actually comes from Shakespeare, who adapted it from the Egyptians.
"The Dog Star", Sirius, becomes more apparent at this time of year.
And for those who planted and reaped according to the calendar, the arrival of the "dog star:" signaled the hotter weather.
This type of marking the passage of the seasons was important to agrarian societies, and as a result, important to the food supply.
Since that time, we have adapted the reference to refer to days so hot that even Dogs won't come out of their cool shade... or pant a lot.. or need more water... etc.
But the origin is still the same.
August is here. Stay cool.