Animal behavior is primarily influenced by instinct, environmental factors, and learned behaviors. Dogs, as social creatures, rely heavily on their owners for care and companionship. Running away from a comfortable and caring home environment contradicts their social nature and survival instincts.
Moreover, pets do not possess the same understanding of life, death, or illness as humans. While they might display changes in behavior due to discomfort or pain, they do not consciously plan or execute actions based on knowledge of their condition.