These here's the dog years and motherfuckers don't shed

from Diddy (Ft. Jay Z & The Notorious B.I.G.) – Young G's Lyrics on Rap Genius

Meaning

“Dog days” (or in this case, years) are considered the hottest parts of the summer, when everyone usually acts in a slow or lazy fashion. Jay uses some dog/shed wordplay here to say that these people won’t “shed,” or change/ move on

Dudes in the hood are stuck in their ways but dog years also refers to the lifespan of the canine species, here he puns the phrase to mean dudes' lifespan dogs = dudes …

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