Why does my dog always throw up?

I have a Golden retriever that's 4.5 years old. As far back as I can remember, he throws up all the time. Every time he eats, he throws up his food (still almost looks the same as before he ate it) and then goes back to eating. He burps a lot, and sometimes he will throw up a white foamy looking mucus. A few minutes ago, he drank water and when he jumped back on my bed, he threw up a little bit of fluid. What is wrong with my puppy?! It scares me that it's something major.



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