My dog is sick death breath not his teeth i do luv to take care of him he is not neglected?

lets get it straight! uno is very healthy. he is 13mnths always eats dry healthy food {beneful/iams/alpo} denta bones rawhide i try to make sure a healthy diet never junk i did notice a dead bird after the fact he won eat or drink 2days tryed milk boost water can food he usally luvs when mixed is cod liver a option