How old is it's food? Dog food will go rancid and cause nausea and vomiting. We used to buy the big bags of Iams or Science Diet but found that it took too long for our lab to go through the bag and it would go bad. Especially in summer when the house is significantly warmer. He would throw up frequently and then just stop eating. We'd get a new bag of food and he would go right back to being normal.
You said it was a pup but if you bought a big bag when you got it (8-10 months ago), it could be the food.
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