everytime i take my patt for a walk i get her halti on and she keeps grinding her teeth ,is cause of the halti

I have a Patterdale x JRT and she grinds her teeth all bloomin night !! -I've got OH on one side snoring and grinding his teeth and her on the other !!!
But I don't know if the halti would cause it -I wouldn't have thought so

Is the halti too tight? My Patterdale grinds his teeth when he's asleep also. He doesnt do it when out walking though, although he isnt on a halti. Is the Pat pulling still with the halti, it could be that its trying to pull away and gritting its teeth together?