Can You Take the Terrier Out of a Jack Russell??

by Tianna
(Quebec, Canada)

I don't want to take the terrier out of our JRT, but I would like to know how to exhaust it before my 3 kids get home and seemingly erase all the training I just completed. Panda is a 12 week old JRT, he is our first. We also have a 3yr, 6yr and 8yr old kids. We have all fallen in love with Panda and he knows I am alpha, I do all the training with him and give him the majority of the treats. I have the kids give him dinner in his dish, or kong, or sometimes out of their hands so he knows food comes from them. My problem is that when we play fetch with him, he doesn't seem to be able to "come down". We have resorted to putting him into his cage the past couple of nights to quiet down, which he has no problem with, but I do. Is this a symptom of lack of exercise? I run him/ train with commands for about 30 mins reach day, plus we play fetch at home. My husband and I are both runners and would love to begin to train him to run with us, but he is still way too young. But once we stop playing fetch, he will still snap and my kids and act aggressively, he even got into an aggressive stance with me the other night when I tried to take his toy away. He understands the command "drop it" with his leash and we are working on it with his toys, but tonight I tried with treats, is this going too far?? Super long question, sorry, but I know his is a fabulous puppy and I would hate for us to mess him up! I would love any and all feedback. Thank you.