From the Bigotian Penitential, author unknown, 7th-8th century:

He who vomits the host because of greediness, [shall do penance] forty days, but if
with the excuse of unusual and too rich food, and from the fault not of over-
saturation but of the stomach, thirty (days). If by reason of infirmity, he shall do
penance for twenty (days). Another (authority) says differently: If by reason of
infirmity, seven days; if he ejects it into the fire, he shall sing one hundred psalms;
if a dog laps up this vomit, he who has vomited shall do penance for one hundred
days

From the Penitential of Cummean, Seventh-century Irish text, written by Cummean of Clonfer (probably the “other author” referred to by the Bigotian Penitential):

If he suffers to the point of vomiting, though he is not in a state of infirmity, for seven days. If, however, he vomits the host, for forty days (…). If dogs lap up this vomit, he who has vomited shall do penance for one hundred days.