Dog ate Sago Palm seed on Palm Sunday

Couldn't make this up. Was trimming one back, youngest son found the seeds and picked them off, cracked one up and Tank ate it.

Has already thrown up 3 times. My vet is on his way back to town from vacation but won't make it back here till midnight. Says to make him vomit as much as possible until no signs of the seed where coming up then bring him in first thing in the morning.

I know it's very toxic to dogs and the seeds are the worse part. Hope this isn't the end for my best friend of 12yrs