
My lot are suspicious of GSD's and it's something that's stemmed down from my first LM bitch, she always gave them a wide berth and it's carried on down. Mia isn't 100% happy around giant breeds, she gets worried - she did get chased by a rather exuberant Great Dane several years ago so this might be part of the reason.
They give Collies a wide berth too probably due to the fact there were 2 highly aggressive ones walked on one of the walks we went on, in fact everyone gave those 2 a wide berth and their male owner had the same temperament too (Thankfully they've moved!).
Curtis isn't keen on black male Labs due to our neighbour having an aggressive one which almost hurdles over the fence when I pass with mine, it's now turned into a growling exercise through the fence.
Asti did have a thing for WHWT & Whippets, no idea why she just went all 'googley' when she saw them even in her dotage she would get all cocky eared and frisky around them.