The conscience is a voice that appears in various forms, such as Garfield's food bowl and blanket.
The conscience tells Garfield to stop eating so much, sleep less and have a nicer attitude. However, it once said that pushing Odie off the table was "kind of fun". It has also hated Mondays when Garfield smashed it (as the alarm clock) on a Monday.
- In its first 6 appearances, it said that it appeared in forms Garfield would understand. In its second group of appearances, it appeared in an empty bottle.
- The conscience once said that it looked like everyone's mother.
- Other consciences for Garfield have appeared in forms such as donuts.