My dog hasn't eaten for 2 days. He has tried however he throws it up within 10 min... he is not eating and faster than before. It has been in the 80's here the past 2 days. I worry that he will become dehydrated.

That is a very valid concern, heat and vomiting both will dehydrate your dog. At this point a trip to the vet is in order to see if electrolytes are needed and what's causing the upset.