Definitely a corn chip. If Mortimer gets upset, he starts smelling like an hardboiled egg.
It is the oil itself but the bacteria and yeast that feed off of it that is the source of most odor. Keep in mind some bacter and yeast on the skin is normal and th imune system normally keeps them in check. but thinks like allergies, seborrhea deeper skin fold and the like can create an in blanace and allow the yeast and/or bateria to proliferate,I read somewhere that the hound stink is something to do with oils on their skin and regular dog shampoo can make it worse