Pets and Companion Animals [LL070]; Prion, Viral, Bacterial and Fungal Pathogens of Animals [LL821]; Microbial Ecology [ZZ333]; Animal Nutrition (General) [LL500]; Feed Composition and Quality [RR300]; Animal Genetics and Breeding [LL240]; Animal Health and Hygiene (General) [LL800]; Animal Welfare [LL810]; microbial flora; pathogens; grasses; ingestion; breeding methods; pet care; animal welfare; coronavirus disease 2019; viral diseases; human diseases; disease transmission; dogs; Porphyromonas gingivalis; Streptococcus mutans; Severe acute respiratory syndrome coronavirus; Severe acute respiratory syndrome coronavirus 2; man; Poaceae; Canis; Canidae; Fissipeda; carnivores; mammals; vertebrates; Chordata; animals; eukaryotes; Porphyromonas; Porphyromonadaceae; Bacteroidales; Bacteroidetes (class); Bacteroidetes (phylum); Bacteria; prokaryotes; Streptococcus; Streptococcaceae; Lactobacillales; Bacilli; Firmicutes; Severe acute respiratory syndrome-related coronavirus; Betacoronavirus; Coronavirinae; Coronaviridae; Nidovirales; positive-sense ssRNA Viruses; ssRNA Viruses; RNA Viruses; viruses; Homo; Hominidae; primates; Poales; commelinids; monocotyledons; angiosperms; Spermatophyta; plants; oral cavity; microflora; animal rights; SARS-CoV-2; viral infections