one of the vets at work has 2 little chihuahuas, the smallest is the most aggressive (of course

) and is not only kennel aggressive towards people but also other dogs, including oscar, who could have him for a nice light snack

Luckily Os does not take issue with aggressive small dogs and simpy tries to avoid them...
In some ways I think larger dogs tend to be a lot more tolerent of a lot more things all around, or maybe it boils down to ownership, again
congrats on your girl being more tolerent, its always nice to have harmony in the fam.
Malli