u/Aggressive_One1697

Hi there, recently my female dog lost her brother companion due to an illness. She is 9m old, Boston Terrier x. She is fixed and has been since 4m old. Her brother was also fixed @ 4m old and i never noticed they played like that or anything. I noticed that ever since he died (.a week or so ago) she has been "humping" my partners arm. She doesnt grind down on it or anything, she just makes the motions. Obviously, I realize this is harmless but I am wondering if this is a stress sign or what else it could be...any thoughts?

Thank you and I appreciate your help.