Hello ray i know i'm not calvin but i thought id answer you.
pet's cannot die or expire. They do go home if you don't feed them though. No hp, only fullness. Feel free to check my pet guide for more info http://forums.maplesaga.com/index.php?threads/the-pet-guide.1900/
To my knowledge, even if your pet appears to still be hungry visually, then it's only a visual bug.
As long as the pet fullness goes up you should be okay!
Make sure you double check and click on your character to see if the pet fullness is rising when you feed your pet.
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