Koda, 3yr old Rottweiler x Mastiff

Unfortunately im having to rehome Koda
NOT GOOD WITH OTHER DOGS (particularly small ones)
She is a loving friendly girl.
She knows all the basic commands sit, down, stay, roll over. but sometimes she needs to be told more than once
She is good with kids (still never leave her unattended)
Unfortunately recently she has become not so friendly to other dogs so she must be the only dog.
This is a very hard decision to make as ive has her since 12 weeks old but I don’t have the experience, knowledge or confidence to train or try to fix this issue.
Please no judgement.
Please flick me a message if you would like to meet koda