1. Handbook of behavior problems of the dog and cat;Landsberg,2003
2. Differences in the behavior of dog breeds;Coppinger,1998
3. Paedomorphosis affects agonistic visual signals of domestic dogs;Goodwin;Anim Behav,1997
4. Population biology and ecology of feral dogs in central Italy;Boitani,1995
5. Social and communication behaviour of companion dogs;Bradshaw,1995