I was playing with my friend's two bulldogs and i noticed that they had different sounding barks. It wasn't drastically different but different enough to notice when listening carefully. They are about the same weight and size though one is a few years older. I wonder if age was the factor in which them to sound different since it is rather prominent in humans, especially when going through puberty. Size, age, and weight probably all factor into a dog's voice but I suppose I just haven't really paid any attention to it. A small dog's voice is high-pitched and a large dog is lower-pitched and I just left it at that. I never even thought about comparing voices of dog's, which are close in size, weight, and age. Would they sound almost identical or can they be vastly different as seen in humans? I wonder how different dog voices can be in terms of different breeds as well.
As a long-term project I think itíd be interesting to document the voices of a couple dogs or more throughout the span of their lives. At least two of the dogs should be of the same breed. I suppose they donít have to be the same age as long as their voices are documented from the time they are pups. One can always go back into the audio recordings to compare the voices at a certain age even if the dogs arenít of the same age.
Extending it beyond dogs, I wonder how differently other breeds of animals sound form one another. I think itís safe to assume that a catís meow can be different from one cat to the next if a dogís bark can differ from another. I havenít spent a long enough time with goats or farm animals to notice but do they sound different from one to the next? Perhaps even a snakeís hiss can sound different. I feel animals can be given a sense of individuality if they sound different than another of their kind just as humans do.