Why/how can dogs sense an ill/dying animal?

My collie never pays much attention to our smaller animals, but when a hamster and budgie were ill he would stare at them for longer than he normally would. The next day or few hours later they would die. I wondered if this was part of their pack instinct, where animals know which is the weak member of the herd etc. or if it is something else. I'm just curious.



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