Lyric discussion by beepstreetbiscuit 

I feel that the black dog is meant to represent what Deepak Chopra refers to as the 'shadow energy' or the part of the soul which has remenants of pain and suffering experience which have not yet been dealt with. As a result these shadow energies produce negative beor through the individual. As an astute subject of depression i'd assume that Drake had many shadow energies resting upon his sholders.. The specific difficulty he mentions in the song is his inability to cope with change and growth "I'm growing old and I wanna go home"

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