Oh dear.....i'm really not too sure about this one......the pup I previoiusly posted about that was growling at my older dog of 20 months......has after playing together for half the night - growled at the older one again over a toy and because the other one just stood and looked the pup lunged at the older one - as in going for her.........

That cannot be normal behaviour for a puppy can it ?

How old is this spawn of satan pup????

She is twelve weeks old !!!!!!

This isn't very normal is it ?

I think it is quite normal for a pup who is too big for her boots!   Are you taking her away from the situation, or are you letting your bigger ones put her in her place?

I would be inclined to do the latter - unless at 12 weeks old, she is a bigger breed than the other two (giant breed /toy breed I mean) otherwise she won't learn!

Margot

She's 12 weeks old .....

My other dog ran away when she lunged at her, she just stands looking at her when she growls as if to say ----what's wrong with you ???!!!! 
But when the pup had a go - she ran away .

You could ask the breeder if the dam disciplined the pups. Sometimes they don't. I once had to turn a litter over to strict old Great Grandma to stop them all being Spawns of Satan thanks to their doting, soft Mama. G-Grandma soon sorted them out! I'd think that your older dog will soon nip Pups in the bud for her forward behaviour.

I'm not sure about her mother ------ she came from a rescue foster home and before that from a farm of working BC's ........