to update from my last thread, my sisters dog a jack rustle was attacked by a bullmastiff type dog a few days ago and today sadly lost her fight for life

after surviving the 3 hour long op to try and put her together again she sadly had major organ failure due to ruptured organs?i think, my sister was crying the whole time trying to tell me.
Seems such a waste of a little life although she had a good one, she was origanally a stray and lived with my sister for 11 happy years. i did ask for help regarding what could be done about the owners who let their dog loose on a public street, ive tried to let my sister know what she can do but at the moment she is far to upset to do much, she doesnt have kids at home so im sure everyone on here knows how they become like our children.
is there any advice on her other dog who is now pining for her mate, jess has lived with bob all her life and is now searching the house for her friend

will she just learn to be on her own?