If you opt to brain tan, cook the brains(outside) several different ways to apply the brains to the hide, after brains are rubbed into the hide, stake it by stretching over a pole or rounded stump until dry, them smoke it for several hours over cool smoke, not hot! The smoking will set the brain oils into the hide and allow it to dry soft if it gets wet. Caution, your lady may decide she needs a new dress. Good move to save the brains
. You can also find them in the meat section or butcher shop.
Hawkdancer
Every critter has enough brains to tan his/ her hide