My dog mojo is dying for the reasons that he won't eat drink and is very inactive which is the total opposite then his normal self. All my family loves him and he hasn't even reached:( one year of age. All my little nieces and nephews are asking for him how do I help him make it out alive or break the news to my kids

Please take your dog to the vet, if you haven't. That's not normal behavior in any animal.