Dog trouble advise please?

i have got a collie/german shepard cross hes just over 2 yrs we had him from 6wks hes quite hyper but not bad behaved now we have been given a staffi/bull mastiff cross and she is 1yrs old both have had injecs and bot been done so dont need to worry about pups but she is quite quiet and dont seem to be very happy with the presence of our 1st dog. (sash is female and scooby is male) sash is ok if scooby is sitting donw and not jumping round like a kangaroo on speed but as soon as he get to his feet and starts jumping she aggressive. but when she is showing her aggresion she is backing off from him im not sure what to do or how to address the situation and ideas any1 please EXCEPT giving sash away thank you