3-month white schnauzer biting older whippet

by donna
(devon)

Hello,
We have a white schnauzer and for the last two weeks she has been really biting our 4 year docile whippet, she races around the room jumping on the whippet.
Do you have any ideas to help?

We have been playing with her when she has been doing this but now she keeps on at the whippet.

Any help would be truly appreciated.
Thank you