
Hi, I have had 4 Frenchies in the last 3 years - 2 pieds and 2 brindles - have 2 at the moment. 3 have been boys and 1 a girl- Had a boy, added a boy, lost a boy, added a girl, lost the boy, added a boy.
All of them have been an absolute pleasure to own and take anywhere. If anything, the boys have been more interested in meeting and greeting other dogs, with no issues where as the girl raises her hackles but doesn't bark or try anything and once she's had a sniff, she's fine. I have found the pieds to be more boisterous ( both boys) and the brindles to be the most affectionate with the girl even more so and want to be glued to my side! :-D with both her and the brindle boy being the most gentle and easiest to train.
Frenchies would far rather be with humans than other dogs IMO and some
are rather dog unfriendly. Of the people I know with dog unfriendly Frenchies - they are boys, neutered and intact. On the other hand, I know people with 2, 3, 4 of them with no trouble at all.
I'm not sure if dog unfriendliness is down to the lines or just the individual personality of the dog itself. If buying from a good showing home, you can ask about previous litters and their temperaments and at the very least, you would check the bitch's and stud's characters.