Table 1. The proposed FORQ.

The proposed FORQ (feline oral cancer owner-reported quality of life questionnaire) represents a refined version of our pre-FORQ; low-performing items have been removed to improve efficiency of the instrument, and this is the final version being put forward for future and continued validation.

During the past 7 days, my cat:	No	If YES, how often did your cat have it?				If YES, how severe was it usually?
		Rarely	Sometimes	Usually	Always	Mild	Moderate	Severe	Very severe
Behavior
• Had low energy?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Was reluctant to wake up?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had altered mood?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had trouble getting comfortable?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Growled or groaned when resting?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Could not maintain hygiene (i.e., grooming)?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had decreased appetite?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Drank less water than usual?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
Activity
• Had trouble with mobility?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Did not do what he/she likes (e.g., chasing, playing, etc.)?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Did not act like his/her normal self?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had decreased enjoyment of life?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Did not sleep well?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
Interaction
• Showed a decreased amount of affection?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
Oral/facial discomfort
• Had excessive drooling?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had difficulty eating his/her normal food?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Was offered and had trouble eating soft food?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Had trouble lying down his/her head?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$
• Felt discomfort or pain near the mouth?	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$	$○$

Notes.