Dog barking performs preventive function , which can take advantage of and people.

Dog bark collar is choice for your dog. But watchful dog barks no matter whether it will accept the barking man , other dogs or even a creature . Hence, in such situations barking is automatic snooze, expressing a certain mood , and has nothing to do with rational activity , or at least with the acquired behavioral skills . Sound shades barking could mean anything - from extreme to severe fear aggression . To understand that when two dogs barking wants to express one of them, they do not necessarily need to be familiar . Intensity and shades besides barking mood very definite evidence about sizes and dogs . Little timid dog heard echoing unfamiliar big dog barking , often frightened , even if its " source" is very far away and she could not see him . Dog familiar with the other knows and barking and can obviously use their knowledge to discern the voice of an unfamiliar dog , and also to determine its size and degree of hazard. But we do not know how to behave in a small dog is not familiar with other relatives and are not versed in the nuances of their voices . Hearing the voice of a sudden a big dog if she could distinguish it from a small voice ? Most likely the dog that does not have such experience , hardly will be able to correctly determine the size of the interlocutor on the pitch . Meanwhile, in a pack of wolves do not show such strong differences in the size of individual specimens , and consequently, in the nature of published her voice.