Monyosh

Hi Everyone, Some good friends I visit regularly got a Japanese Seitz puppy about 6 months ago. He was fine with me until he saw me with the vacuum cleaner a month ago (I didn't know at the time he got upset by it) Now he growls at me often and even with my friends intervening to say I'm a friend it isn't changing. Is there any way to undo the association between me and the vacuum cleaner? Thank you monyosh