SOrry I was gone for awhile...I was playing paintball all day

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Just so its clear....Im making the cake for a doctor who is my boss.
Anyways....im learning so much!!
Thank you for everyones help! THeres so many things to consider...I didnt realize there wansnt a black and white answer.
I really need to ask....because now that you guys are bringing this whole allergy vs. intolerance deal...im not really sure what he is. Everyone at my office just says hes lactose intolerant...I guess because of a lack of knowledge. I dont think anybody ever gave it enough thought to ask him. BUT I do know we have to specify no butter...or milk when food is cooked for him. SO, it sounds like this slight difference makes a big difference...
Who knew?
BUt again..thank you all for your imput.....
Im still very intrigued because now I would like to try all the recipes and see if you can really tell the difference....hmmmm!! ANd Im curious....I cant wait until work on wednesday so i can ask!!! lol (first time im anxious for work in a while lol )