I dont know whats wrong with my puppy?

my little puppy is a red/blue nose pit and he hasnt been eatting for 3 days now and i dont know what wrong????
HELP ME PLEASE

thank u
Update: my puppy is a red/blue nose pit and he hasent been eatting for 3 days now..His eyes are watery,cold nose,and and hes body tem. is warm wat do i do???
Also i cant take him to the vet i dont have the money????
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