peptostreptococcus canis peptostreptococcus canis peptostreptococcus canis is a bacterium from the family peptostreptococcaceae. peptostreptococcus canis scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: peptostreptococcaceae genus: peptostreptococcus species: p. canis binomial name peptostreptococcus canislawson et al. 2013