Hi Lindyloo, this sounds pervectly normal to me,....as pups this how they learn....My daughters pup Indie, sounded realy viscous when she was younger.....And when she brings her round to play
with Nell my lab ,... all hell breaks loose. ???But we just watch them and step in if Nell is getting to boisterous.... Having said that Indie can give as good as she gets!!!after stopping Nell because she was getting too rough, and trying to flatten poor Indie,.....
Indie, came round the back of her and nipped her bum.
Nell didnt like that and considered retreat. lol
This is all part of the learning proscess.