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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
Eating a tub of butter is not necessarily toxic, but it is a big ingestion of fat all at once. If he has already vomited that is good and will minimise the amount of fat he is exposed to.
I would advise starving him for 24hrs before offering a light diet for the next few days
- plain boiled chicken and rice, a little scrambled egg, plain white fish or light cottage cheese. This can help take the strain off an irritated stomach and help things settle down. Giving ranitidine (zantac) 2-3 times daily as an antacid approximately 1 hour before his meals can help things settle down too. It should be available over the counter at most pharmacies. For a 100lb dog I would recommend a dose of ~100mg 2-3 times daily. You should be seeing an improvement over the next few days. At that point, you can start to re-introduce his normal food.
If he continues to vomit over the next 24 hours especially if he is not keeping water down, I would recommend having him checked over by your vet.