I probably not the best person for advice about this type of behaviour in dogs because i have never experienced it, you need to make your mark as the pack leader as soon as you get your dog, when i got my dog i started straight away. i pretend to eat her food before i give it to her (pack leaders always eat first) i walk through doors first ect ect.
When your dog gets aggresive have you tried leaving the room and giving your dog time out, normally people would put the dog in a other room but obviously you should not pick up a dog thats growling at you so i would try saying no in a stern voice and then just walk out the room he will eventually get the message.
good luck

my jack russel loves watching films her favourite is 101 dalmations and turner and hooch lol.

thanks for the replies everyone, i'm just stuck on what to feed my dog i would like to give her a varied diet but its so hard. she eats bakers puppy food, chicken, turkey, past and rice (not all at the same time lol). i dont really want to give her dog meat as i heard the stuff they put in it isnt very healthy for the dog. 

Can dog eat ready brek? they say porridge is good for you but is it good for dogs, i would like to give my dog a nice breakfast on a morning and since i eat ready brek i was just wondering can my dog eat it, but obviously i would not make the ready brek with milk it would be made with water.

tea-lady your jack russell is gorgeous, and it's true jack russell never grow up so i understand what you mean when you say shes as mad as ever .

I would have to say being a jack russell owner that jack russell are my favorite breed of dog they are very, very intelligent i have no problem training my jack russell. I learned her how to sit within a week of bringing her home.  She is now 8mths old and knows lots of commands and tricks. She makes me so proud and we always work well as a team.

Here is Imagin my 8 mth old jack russell, this picture was taken when she was 3 mth old.

Thanks for the nice welcome. Emmamae you have a Elkhound they are truly beautiful dogs. My dog is a little rascal    shes so intelligent she shocks me, she knows how to wrap me round her little paw lol .

Thanks i will take a look. It so hard to find a good dog training class.
 

Hi, thought i would introduce myself my name is Mahalia i'm 23 and i live in Leeds with my boyfriend and my 6 mth old jack russell named Imagin. I have come to this site to make friends with dog lovers like myself. Feel free to pm me like i said i'm always up for meeting new people

speak to you soon
 

Hi everyone i'm new but i'm already loving this site. I have a 6 mth old jack russell her name is Imagin i have taught her lots of things already but i would like professional help. Could anyone recomend a good dog training class near Leeds West Yorkshire. Thanks