Clip the dog's nails. If left untrimmed, a dog's nails can curl under into the paw pads or twist toes in a way that causes joint damage. To keep your dog's nails short, clip them regularly, depending on how fast his nails grow. If you can hear his nails on the ground when he walks, that means his nails are touching the ground, and are too long. 
Domestic dogs inherited complex behaviors, such as bite inhibition, from their wolf ancestors, which would have been pack hunters with complex body language. These sophisticated forms of social cognition and communication may account for their trainability, playfulness, and ability to fit into human households and social situations, and these attributes have given dogs a relationship with humans that has enabled them to become one of the most successful species on the planet today.:pages95-136
^ Jump up to: a b Thalmann, O.; Shapiro, B.; Cui, P.; Schuenemann, V.J.; Sawyer, S.K.; Greenfield, D.L.; Germonpre, M.B.; Sablin, M.V.; Lopez-Giraldez, F.; Domingo-Roura, X.; Napierala, H.; Uerpmann, H.-P.; Loponte, D.M.; Acosta, A.A.; Giemsch, L.; Schmitz, R.W.; Worthington, B.; Buikstra, J.E.; Druzhkova, A.; Graphodatsky, A.S.; Ovodov, N.D.; Wahlberg, N.; Freedman, A.H.; Schweizer, R.M.; Koepfli, K.- P.; Leonard, J.A.; Meyer, M.; Krause, J.; Paabo, S.; et al. (2013). "Complete Mitochondrial Genomes of Ancient Canids Suggest a European Origin of Domestic Dogs". Science. 342 (6160): 871–874. Bibcode:2013Sci...342..871T. doi:10.1126/science.1243650. hdl:10261/88173. PMID 24233726.
Amongst apprenticeship programs and other hands-on training activities, Petco pet stylists who are trained from within the company are required to attend and pass Petco's comprehensive 12-week Pet Stylist Apprentice & Certification academy program. In addition to hands-on grooming training with a Petco-certified pet stylist mentor or instructor, all participants receive instruction in health, safety protocols and grooming salon operations. At the end of the program, candidates must pass a technical skills assessment in order to become a Petco Certified Pet Stylist.