Are male dogs friendlier than female dogs in general?

I haven't found male dogs to be distinctively different from females in regards to being friendly. I volunteer at the city shelter 4 days a week so I interact with a large variety. I have noticed a difference among the breeds.

Sharpais and cattle dogs tend to be less affectionate and more wary of people in general. Pit bulls are very affectionate in general. I think dogs can be as individual as people in some respects.

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