I have had their old heads get bigger that that , but that's a good one . when bit around the head you have to watch out for their airways to get restricted . but I have never had a dog die from a snake bite . the bite doesn't hardly ever kill them it is secondary infections that will do them In . all ways put them on anti-biotics after a bite .
That's what the vet told me, that the bacterial infection from the bite is worst than the bite itself