Ollie is just playing and was expecting the other dog to respond. Since he didn't make the move, Ollie finally had to do it! All in fun.
That’s playing. Nyala does it all the time to Duke. Once she charges into Duke, she’ll nudge him with a side butt kick. She does that to engage him. Duke’s not a big player unless Nyala pushes him into it. Then there’s no stopping them.