Table A1.

Questionnaire applied to cat owners.

Topics	Question	Options	Type of Question
Owner’s information	Owner’s gender	Male/Female/I don’t want to answer	Multiple choice
	Owner’s age	From 18 to 30 years old/From 30 to 50 years old/From 50 to 70 years old/Over 70 years old	Multiple choice
	Owner’s actual residence	Viana do Castelo/Braga/Vila Real/Bragança/Porto/Aveiro/Viseu Guarda/Coimbra/Castelo Branco Leiria/Lisboa/Santarém/Portalegre Setubal/Évora/Beja/Faro	Multiple choice
	City of residence		Open-ended
	Owner’s academic qualifications	Elementary School (1st Cycle) Elementary School (2nd Cycle) Elementary School (3rd Cycle) Secondary Education/Graduation Bachelor’s degree/Master’s Degree PhD (Doctorate)/Other	Multiple choice
	Owner’s professional activity	Student/Employed/Unemployed Retired	Multiple choice
	Number of members in the household		Open-ended
	Do you have other pets?	Yes/No	Dichotomic
	If the answer is yes, please list the species	Dog/Cat/Ferret/Birds/Other	Multiple choice
	How does the household normally interact with your cat?	Not much interaction (feeding, watering, cleaning the cat’s litter box)/Playing, petting, and cuddling/Resting on the lap/Sharing the bed/Sharing the sofa/Other	Multiple choice
	How often do you usually give attention to the cat?	All day long/During a part of the day, e.g., in the evening/Only in some moments of the day/We do not usually provide any attention to the cat/Other	Multiple choice
Cat	Status	Non-neutered/Non-spayed/Neutered/Spayed	Multiple choice
	Gender	Female/Male	Dichotomic
	Age	Under 1 year/From 1 to 5 years/From 5 to 10 years/More than 10 years	Multiple choice
	Breed	Persian/Maine Coon/Siamese/Scottish Fold/Norwegian Forest/British Shorthair/Bengal/ European Shorthaired /Other	Multiple choice
	Is the cat mainly indoor (stays inside) or outdoor (have access to the road)?	Indoor/Outdoor/Indoor and Outdoor	Multiple choice
	Do you usually vaccinate your cat once a year?	Yes/No	Dichotomic
	What about deworming? How often do you do it?	Every 3 months/Every 6 months/Every year/When possible/I do not usually do it	Multiple choice
	Did your pet show any unusual clinical signs and/or behavior change since the beginning of the pandemic?	Yes/No	Multiple choice
	If the answer is yes, please specify which ones	Respiratory disease (coughing, runny nose, sneezing, runny eyes, dyspnea)/Apathy/ Fever/Digestive disorders (diarrhea, vomiting)/Skin problems/Loss of weight/ Loss of appetite/Behavioral disorders/ Conjunctivitis/Other	Multiple choice
	Does your animal present any chronic disease?	Yes/No/I don’t know	Multiple choice
	If the answer is yes, which one/what one?	Diabetes/Kidney/hepatic disease/Joint disease/ FIV/FeLV/Heart disease/Hypothyroidism /Gingivostomatitis/Other	Multiple choice
	If the answer is yes, is monitoring therapy performed for that chronic disease?	Yes/No	Dichotomic
	If the answer is yes, what is the name of the medicine?		Open-ended
COVID-19	Has the owner been diagnosed for COVID-19?	Yes/No	Dichotomic
	Has another member of your household been diagnosed with COVID-19?	Yes/No	Dichotomic
	How was the diagnosis performed for COVID-19?	With nasopharyngeal or oropharyngeal swab for PCR test/With nasopharyngeal or oropharyngeal swab for rapid test/With blood sampling for serological test (antibodies)	Multiple choice
	During which period(s) did you obtain positive test(s)? You can select more than one option:	1st wave (April 2020-September 2020)/2nd wave (October 2020-December 2020)/3rd wave (from January 2021)	Multiple choice
	During the time when the household member was living with COVID-19, did he/she interact with the cat?	As usual/Reduced interactions/Reduced interactions and used protection (mask, gloves) while interacting/Did not interact/Other	Multiple choice