Dogs have different pitched barks for the same reason humans have different pitched voices. For each breed the pitch of the bark is different because of size and their body structure. Big dogs, such as Great Danes, have much deeper barks than small dogs, such as Chihuahuas.
It depends on the dog. Dogs can produce different barks depending on their mood. The dog's size also plays a part. Some have a higher pitch and some have a really low/deep barks. Some are really loud barks and some are kind of low growls.
Other dogs, noises, people, cats and the postman! Some dogs even bark when the wind blows. They must be taught when it's appropriate.
They can have: cats, not dogs (because when you are praying, it barks and disconcentrates you when you are praying). Ask some other people because I only know that we cannot have dogs as pets
They probably bark at bigger dogs because they want every dog to know that just because he is small, he's tough. Some little dogs do that. They like to stand their ground/
dogs can see in the mirror, my dog sometimes barks at himself in mirror. they also will watch the TV. ALthough some just don't react to the other dog "in the mirror".
Due to the possibility of some male dogs having higher levels of estrogen than others, yes it's possible for a male dog to have teats. It is however mostly unlikely.
Well, its just like how some people like some kinds of food and others dont. Its the same with dogs.
Certain dogs are fidgety in the bath others are not Certain enjoy them and others do not Some are harder to clean than others
Some dogs are kept as pets whereas others are wild.
Only some barks are thin. Some like the sequia or the cork oak are very thick. It depends on the trees environment.
some times, others not
because some are higher than others