Lola had bald spots that werent alopecia (usually is black skin underneath) but more food allergy related. We did try the melatonin human pills but all i could find were mint flavored and Lola wanted no part of those. So we ended up changing foods. Moved off of beef and added some salmon, which I think was the key in growing the hair back. She had HUGE bald spots on her left flank, I thought the hair would never grow back. But it did. Tried to switch to salmon exclusively, but it gave Lola hives. After the hair grew back, we feed boar and bison raw patties. She was bald for about 8 months I'd say. never itchy, never wet.