If you feed one 5-7 pieces of meat colored the same as their saliva, they get fat and flail around.
You can make it vomit in this state by attacking and scaring it.

White → Raw Meat
Purple → Poisoned Meat
Yellow → Tinged Meat
Light Blue → Drugged Meat

※Feeding them meat that is not the same color as their saliva will make their bellies fat, but they will vomit less often.

Lost items spit out in the order of 2 white, 2 green, 2 purple, 2 blue, 9x max.
・If you keep feeding meat that is all the same color as his saliva until he is full, his vomit will start at purple.