Always kept my dog on a healthy diet, didn't really let her eat human food at all that I can remember.
My cat refused human food, even tuna, she'd eat dry and wet cat food that's it, she'd always want to smell whatever I was eating but would always refuse to eat it.
I had a pet rat back in school who was all about the chocolate chip cookie dough!
Was so cute to see her eat it then lick her little fingers clean.