PLEASE help me! my chihuahua killed a gheco!!!!!!!!!!!!!!!!!!!!!!!!!…

When I woke up today I found out my four year old chihuahua killed a gheco,he didnt eat any part of the animal.The thing is that he throwed up a few minutes ago but inmediately he ate it,I tried to stop him ,but he´s a quick eater.He already ateand everything but Im worried that he´s poisoned or something.....what should I do? Im trying calling the vet but we cant contact any,meanwhile what should I do? pease help me im desperated!