Several studies report that olfactory cues play an important role in human life; humans are essentially able to recognize other family members and friends by their odors. Moreover, recent studies report that humans are also able to identify odors of non-conspecifics. The aim of this study was to determine whether dog owners are able to identify their dogs by smell and distinguish the odor of their own dogs from those of other dogs. A total of 53 dog owners (40 females and 13 males of different ages) volunteered to take part in this study. A number of the participants (17) owned 2 dogs; these owners took part in the study twice (i.e., working with only one dog at a time). Sterile gauze pads were used to collect odor samples from the dogs. Each pad was placed in its own sterile glass jar (750 ml) with a twist off lid until the experiment commenced. Participants were asked to identify their own dog´s odor from a line-up of 6 glass containers. This experiment demonstrated that dog owners are capable of identifying their dogs by smell on a significant level. Results of this study additionally suggested that male owners outperformed their female counterparts in the identification process. Moreover, dog owners whose dogs were housed outside had a higher success rate in identification than did participants who kept their dogs indoors with them. The dog owners found it easier to identify dogs that had been neutered, fed dry dog food and bathed less frequently. In general, younger dog owners tended to have more success when attempting to identify their dogs than did their older counterparts.

Department of Ethology and Companion Animal Science Faculty of Agrobiology Food and Natural Resources Czech University of Life Sciences Prague Kamycka 129 165 00 Prague 6 Czech Republic

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McGann JP. Poor human olfaction is a 19th-century myth. Science (80-.). 2017;356:100. PubMed PMC

Marshall DA, Moulton DG. Olfactory sensitivity to α-ionone in humans and dogs. Chem. Senses. 1981;6:53–61.

Krestel D, Passe D, Smith JC, Jonsson L. Behavioral determination of olfactory thresholds to amyl acetate in dogs. Neurosci. Biobehav. Rev. 1984;8:169–174. PubMed

Walker DB, et al. Naturalistic quantification of canine olfactory sensitivity. Appl. Anim. Behav. Sci. 2006;97:241–254.

Sarrafchi A, Odhammer AME, Hernandez Salazar LT, Laska M. Olfactory sensitivity for six predator odorants in CD-1 mice, human subjects, and spider monkeys. PLoS One. 2013;8:10. PubMed PMC

Güven S, Laska M. Olfactory sensitivity and odor structure-activity relationships for aliphatic carboxylic acids in CD-1 mice. PLoS ONE. 2012;7:1–9. PubMed PMC

Kavoi BM, Jameela H. Comparative Morphometry of the Olfactory Bulb, Tract and Stria in the Human, Dog and Goat. Int. J. Morphol. 2011;29:939–946.

Gilad Y, et al. Linked references are available on JSTOR for this article: Human specific loss of olfactory receptor genes. Sci. Rep. 2016;100:3324–3327. PubMed PMC

Gilad Y, Wiebe V, Przeworski M, Lancet D, Pääbo S. Loss of olfactory receptor genes coincides with the acquisition of full trichromatic vision in primates. PLoS Biol. 2004;2:120–126. PubMed PMC

Lo GKH, Macpherson K, MacDonald H, Roberts WA. A comparative study of memory for olfactory discriminations: dogs (Canis familiaris), rats (Rattus norvegicus), and humans (Homo sapiens) J. Comp. Psychol. 2020;134:170–179. PubMed

Olsson SB, Barnard J, Turri L. Olfaction and identification of unrelated individuals: examination of the mysteries of human odor recognition. J. Chem. Ecol. 2006;32:1635–1645. PubMed

Laska, M. Human and Animal Olfactory Capabilities Compared. in Handbook of Odor 675–689 (2017). 10.1007/978-3-319-26932-0.

Craven BA, Paterson EG, Settles GS. The fluid dynamics of canine olfaction: unique nasal airflow patterns as an explanation of macrosmia. J. R. Soc. Interface. 2010;7:933–943. PubMed PMC

Neuhaus W. Über die Riechscharfe des Hundes für Fettsauren. Vergl. Physiol. 1953;4:527–552.

Moulton DG, Ashton EH, Eayrs JT. Studies in olfactory acuity. 4. Relative detectability of n-aliphatic acids by the dog. Anim. Behav. 1960;8:117–128.

Kaise H. Olfactory studies in the dog. The KITAKANTO Med. J. 1969;19:396–408.

Becker RF, King JE, Markee JE. Studies on olfactory discrimination in dogs: dogs to turn to the right or the left in response to olfactory cues at a choice point in a variety of modified T mazes. Performance was per-functory. The dogs were more concerned with learning the avenues O. Sci. Rep. 1962;55:773–780.

Nicolini P. Olfactory stimulation and its recession (in Italian) Arch. Ital Sci. Farm. 1954;4:109–172. PubMed

Wackermannová M, Pinc L, Jebavý L. Olfactory sensitivity in mammalian species. Physiol. Res. 2016;65:369–390. PubMed

Sarafoleanu C, Mella C, Georgescu M, Perederco C. The importance of the olfactory sense in the human behavior and evolution. J. Med. Life. 2009;2:196–198. PubMed PMC

Zou LQ, et al. What does the nose know? Olfactory function predicts social network size in human. Sci. Rep. 2016;6:4–9. PubMed PMC

Pause BM. Processing of body odor signals by the human brain. Chemosens. Percept. 2012;5:55–63. PubMed PMC

Semin GR, Groot JHBD. The chemical bases of human sociality. Trends Cogn. Sci. 2013;17:427–429. PubMed

Chen D, Katdare A, Lucas N. Chemosignals of fear enhance cognitive performance in humans. Chem. Senses. 2006;31:415–423. PubMed

Peeke HVS, Russell MJ, Mendelson T. Mothers ’ Identification of their Infant ’ s Odors. Sci. Rep. 1983;31:29–31.

Kaitz M, Eidelman AI. Smell-recognition of newborns by women who are not mothers. Chem. Sens. 1992;17:225–229.

Porter RH, Balogh RD, Cernoch JM, Franchi C. Recognition of kin through characteristic body odors. Chem. Senses. 1986;11:389–395.

Alho L, et al. Nosewitness identification: Effects of negative emotion. PLoS ONE. 2015;10:1–10. PubMed PMC

Mitro S, Gordon AR, Olsson MJ, Lundström JN. The smell of age: Perception and discrimination of body odors of different ages. PLoS One. 2012;7:12. PubMed PMC

Zuniga A, Stevenson RJ, Mahmut MK, Stephen ID. Diet quality and the attractiveness of male body odor. Evol. Hum. Behav. 2017;38:136–143.

Havlicek J, Lenochova P. The effect of meat consumption on body odor attractiveness. Chem. Senses. 2006;31:747–752. PubMed

Doty RL, Ford G, Preti G, Huggins GR. Changes in the intensity and pleasantness of human vaginal odors during the menstrual cycle. Science (80-.). 1975;190:1314–1318. PubMed

Olsson MJ, et al. The scent of disease: human body odor contains an early chemosensory cue of sickness. Psychol. Sci. 2014;25:817–823. PubMed

Schaal B, Hummel T, Soussignan R. Olfaction in the fetal and premature infant: functional status and clinical implications. Clin. Perinatol. 2004;31:261–285. PubMed

Romantshik O, Porter RH, Tillmann V, Varendi H. Preliminary evidence of a sensitive period for olfactory learning by human newborns. Acta Paediatr. Int. J. Paediatr. 2007;96:372–376. PubMed

Schaal B. Olfaction in infants and children: Developmental and functional perspectives. Chem. Sens. 1988;13:145–190.

Bader AP, Phillips RD. Father’s recognition of their newborns by visual-facial and olfactory cues. Psychol. Men Masculinity. 2002;3:79–84.

Dubas JS, Heijkoop M, van Aken MAG. A preliminary investigation of parent-progeny olfactory recognition and parental investment. Hum. Nat. 2009;20:80–92.

Roberts SC, et al. Body odor similarity in noncohabiting twins. Chem. Senses. 2005;30:651–656. PubMed

Gilbert AN, Yamazaki K, Beauchamp GK, Thomas L. Olfactory discrimination of mouse strains (Mus musculus) and major histocompatibility types by humans (Homo sapiens) J. Comp. Psychol. 1986;100:262–265. PubMed

Hepper PG, Wells DL. Individually identifiable body odors are produced by the gorilla and discriminated by humans. Chem. Sens. 2010;35:263–268. PubMed

Wells DL, Hepper PG. The discrimination of dog odours by humans. Perception. 2000;29:111–115. PubMed

Courtney N, Wells DL. Last but not least. Perception. 2002;31:511–512. PubMed

Cain WS. Odor identification by males and females: predictions vs performance. Chem. Sens. 1982;7:129–142.

Sorokowski P, et al. Sex differences in human olfaction: a meta-analysis. Front. Psychol. 2019;10:1–9. PubMed PMC

Brand G, Millot JL. Sex differences in human olfaction: Between evidence and enigma. Q. J. Exp. Psychol. Sect. B Comp. Physiol. Psychol. 2001;54:259–270. PubMed

Köster, E. P. Olfactory Adaptation. in The Human sense of Smell (eds. Laing, D. G., Doty, R. L. & Breipohl, W.) 395 (Springer, 1991).

Lenochova P, Roberts SC, Havlicek J. Methods of human body odor sampling: the effect of freezing. Chem. Sens. 2009;34:127–138. PubMed

Hummel T, Barz S, Pauli E, Kobal G. Chemosensory event-related potentials change with age. Electroencephalogr. Clin. Neurophysiol. 1998;108:208–217. PubMed

Doty RL, Kamath V. The influences of age on olfaction: a review. Front. Psychol. 2014;5:1–20. PubMed PMC

du Sert NP, et al. Reporting animal research: Explanation and elaboration for the arrive guidelines 2.0. PLoS Biol. 2020;18:120. PubMed PMC

Straus, J. & Kloubek, M. Kriminalistická odorologie. (Vydavatelství a nakladatelství Aleš Čeněk, 2010).

Pinc L, Bartoš L, Reslová A, Kotrba R. Dogs discriminate identical twins. PLoS ONE. 2011;6:4–7. PubMed PMC

Vyplelová P, et al. Individual human odor fallout as detected by trained canines. Forensic Sci. Int. 2014;234:13–15. PubMed