"Watch your back" means "Be very careful", "Be aware of what's going on around you". The boy interpreted what his grandfather said as meaning that his grandfather killed all those dogs he had had all his life. The boy probably did not know that a dog's life span is much shorter than a human being's.
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"Watch your back" means "Be very careful", "Be aware of what's going on around you".
The boy interpreted what his grandfather said as meaning that his grandfather killed all those dogs he had had all his life. The boy probably did not know that a dog's life span is much shorter than a human being's.
CJ