So last night Juneau and I spent the night at my moms who has a pug. The entire time we were there Juneau kept leaning into the pug with her side and moving her. She would be a few feet a way.. walk swiftly and turn so they were side to side then lean in on the pug and push him up against walls. Is this a sign of her trying to herd or something different? I am just trying to make sure this isn't the start to negative behavior. I have a quick clip of it on my phone if this description is bad. Any thoughts?

I don't really think it sounds like a herding behavior, i think that would be more chasing/nipping/barking. Kai does this all the time while playing with dogs (especially her brother). I think it's more of a play thing. It's never been an issue with us. It's never aggressive and always leads to chasing and tail wagging.

That is how my husky plays with smaller dogs and puppies. I find it is a nicer way of playing than biting them. I wouldn't worry about it unless you notice aggression in it.