
Yes. off property with outsider bitches have little to prove to one another.
With males, many males are same sex aggressive as they want to ensure they are cock of the heap, as nature tells them to make sure they are the top dog who gets any available females.
I always tell new male pup owners that when their boy reaches puberty and adulthood that they should avoid meetings with males of more than the initial 3 seconds. Also males are more likely to pick on young males whose testosterone levels are very high, as they need putting in their place.
The only females that I have found aggressive with their own sex (no self respecting male picks on girls) have been bull breeds, and then only the odd one.
Of course you get some dogs that are so screwed up they are generally aggressive.