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Pahoo's right on target. Try something else first, like a paper bag, balloon or a pellet gun. Dog's ears are very sensitive to loud pops and a percussion cap could damage them if too close.
However, if that's what it takes, yes, the residue from caps can be corrosive. It should only require rinsing out the nipple, the chamber and the nipple recess in the cylinder, however. A bit of a good bp solvent will work fine.
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