Commentary for Yoma 165:19

Mar Bar Rav Ashi said – Do not explain the end of the Mishna that way. Where (the ill person) says, "I need (food)," When there are two (doctors or experts) who say he does not need (food), we do not listen to him. We don't say that. When he says "I need" and even if 100 (doctors or experts) say he doesn't, we listen to him. What is the reason? The heart knows the bitterness of the soul.

Our Mishna, he who is seized by bulmos (a disease) – This sickness seizes a person on account of hunger, his eyes become dim and he is in danger of death. When his healthy appearance returns, we know he is healed.

Mad dog – Explained in Gemara.

Do not eat the lobe of his (the dog's) liver – Even though doctors practice this cure, it is not fully effective and would not allow a person to eat an impure animal.

Rabbi Matya ben Harash permits – He thinks this is a complete cure.