Most likely it is because of not having fun with us and probably want's to be "Top Dog"
It depends on the kind, and if they know each other for long for e.g.; you buy them as babies and they are habituated to each other, they may get along. There can be times when they fight, mostly for territory.
You will know your dogs are getting too rough with each other when they start growling and lunging in an aggressive manner.
no if they are brought up with each other but if they dont know each other they will fight
Its the dogs way of sensing (or getting to know) the other mammal (dog) around it. Its a natural ability. But if this "getting to know each other" frenzy isn't just a stroll in the park (normal) it could be a fight, a dog fight. !CAUTION! FOR YOUR SAFETY, DO NOT GET INVOLVED IN THE COMMOTION! :)
Some people do fight dogs for money. THey train dogs to fight and they know it's against the law but they do it anyway. It's a crule thing but people do fight dogs. There's alot of other stuff that they do too. they breed them in an extremely crule way and they do alot of other stuff with them that I'm not going to mention.
why i donot know
i dnt know
It's the same with dogs, they want to know each other's scent. If they know their scent, they won't be afraid of each other.
They may seem to become friends but they are alway foe and will fight at any given moment. They do constantly size each other up and that's were you will see them look at each other like they are going to fight.
They're getting to know each other.
All dogs.. the dogs just got to get to know each other with the cats. There are specific cases where a dog and cat becomes BFFL .
No they were all monks of peace. I should know I was there.