my simon (a malamute) loved gum! i'm not a gum chewer but do so occasionally. the second i put it in my mouth it would drive him crazy. he would pace and pace and sit and stare at me until i gave it to him. he would drive me crazy he was so laser focused on the gum. i'd give it to him and he would chew it for a few minutes and then swallow it. he looked sooooo funny chewing it - wide open mouth, chomp, chomp chomp.... 120 lbs of teenager!
another member posted in a thread about it that it takes three or four pieces to cause harm but i don't know for what weight category...
good luck!