sporadic – bordering on consistent vomiting

2 yr old male Pom – from established breeder? – plays well, eats well, has exercise then rests – all normal. 1-3 times in a 2 week period, dog will throw up yellow fluid substance – some times red tinting (blood?) is present. Discussed with vet – removed food for the day and offered food the next day – Dog will eat? so far this seems to work and rules out blockage (vet words)?. Do we need to be concerned? is this going to be a life long challenge (not a problem, just would like to know if something can be done or changed to make the little guy more comfortable?
Appreciate any insights from experts or other dog owners

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