I Wish

I'm 17 yr old female and doing an animal care course at college, I currently own 4 dogs but all are guard dogs, I have been wishing for quite a while now to join the Young Kennel Club but I don't have a dog I can use to train and have fun with( don't get me wrong I love all four of them), as I said all my dogs are guard dogs, 1 of them is really old female jack Russell c chihuahua and prefers to just lay down all day and just do a little exercise during the day, then I have a 5 (miniature jack Russell) and 6 (Jack Russell x ?) year old male dogs but they growl and try to bite people and dogs they don't know, then the fourth dog (Alsatian, one of her ancestors was a husky so she has a bit of husky blood in her which you can tell with her eyes and energetic personality) is nearly 2 but she almost died when she was a pup due to something that was in her bones (she happy and healthy now), vets say she may have arthritis and her joints may give her pain through out her life and gave us tablets for her to take every other day if needed, but she perfectly fine and loves to run around and jump all day, the only thing she barks at is when she's trying to tell the other dogs of for barking at people etc (I guess she not much of a guard dog), I would love to be part of young Kennel club with her but she hasn't been in contact with strangers and other dogs since she was a pup (before she became ill) so not sure what's she is like with other people and other dogs but when family members and friends come down she very lovable and loves to be fussed by them, I'm unable to take her to dog training groups as all the ones near me are way too expensive and that's only for a few 1 hour lessons, I would love to do agility with her because of her love for running and jumping and she is able to jump really high and she loves learning new things and know most of the basic commands, still learning her on the lead as she prefers to run free. Also I make small jumps out of random things at home so she can jump over and few minutes every couple ignore days I play with her and have taught her a little to jump them

I've asked my parents and they are unsure

any thoughts on what I can do if I should go for it and join Young Kennel club along with my nearly 2 year old female Alsatian or not because it could cause her to maybe get pain in her leg (so far she has had no problem since she has recovered)