HELP i have a violent jack russel?

there is no point in neutering him now ... neutering only affects behaviour if it is done before the dogs hormones are fully established ... to neuter him now would stop him impregnating another dog and no effect on behaviour ... i am sorry to say but i think you have a wrecked jack russell that only the most professional trainer could even consider fixing ... a jack russell that has taken over a soft owner and the dog is now 5 years old with ingrained and worsening behaviours ... even with a professional trainer, it is still the owner who has to take charge and sorry, i can't see you doing it ... and jacks that are not trained appropriately only get worse and worse ... my friend owned a jack and the dog was not trained and took over ... that dog got more aggressive and vicious as time ped ... the dog bit the lip off a visitor ... the dog prevented his step-mom from leaving the bathroom and she had to wait hours until someone else came home ... i hate to say it but the dog should be put down ... too much time has ped with the dog only getting more aggressive ... you fear him, you feel sorry for him, so no training is going to work ... i agree with your family and friends and i have a jack russell, i am a jack lover, but i also can acknowledge when a dog is ruined and it is time to go ...