Em,
Big
Hope Chuckie is okay.
GRs/Labs will put anything in their mouths , could he have eaten something that didn't agree with him? My baby got sick from eating a sausage. Her body can't process high fat foods.
Is he still drinking water?
In my area there is a 24 hour Vet I can call? Is there something like that in your area?
Parvovirus is common in my area, I'm not sure of the symptoms of this virus, perhaps you could google it. I pray that it isn't parvovirus.
Thinking of your baby and hope he feels better asap.

*edit* sorry for similar info as BellaB, must have typed at the same time. The puppies I've known who have had parvovirus have survived. They just required a stay at the vets to be monitored and medication.