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"Declarations Ethics approval and consent to participateThis study received approval from the UTAD ethics committee of the project “One health approach in animal cancer Norte-01-0145-FEDER-000078” Ref.: Doc55-CE-UTAD-2021, and adhered to the principles outlined in the Declaration of Helsinki. All dog owners participating in the study provided written informed consent to participate and were made aware of their possibility to voluntarily terminate their participation at any time. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was funded by the R&D&I project “oneHcancer– One health approach in animal cancer”, the operation no.: NORTE-01-0145-FEDER-000078, co-funded by the European Regional Development Fund (ERDF) through NORTE 2020 (North Portugal Regional Operational Program 2014/2020)."