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Dogs frequently eat things they shouldn’t. If your dog ate it in the last hour and a half then you can try to get your dog to vomit it back up. Fatty, greasy foods can cause pancreatitis so straight butter could cause an attack as well. It will definitely cause diarrhea and probably vomiting on its own. You can induce vomiting with hydrogen peroxide 3%. Instructions on dosage can be found here:
If it has been longer than an hour and a half, then you will need to watch your dog for symptoms. Symptoms of pancreatitis vary but include vomiting, diarrhea, anorexia, weakness or collapse, dehydration, shock, fever, depression, and upper abdominal pain. A dog may indicate abdominal pain by acting restless, panting, crying or wincing when picked up, shaking, standing with an arched back, or lying with the front end down and the rear end elevated
You can read about it in detail here:
The good thing is that he is 60 pounds and he may handle the butter better than a smaller dog would. You might want to switch to a bland food like boiled chicken and rice for a few days as well so his stomach gets a little rest.
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