If you want to learn more about training and controlling your Jack Russell, my ebook is bound to save you hours of training trial and error and relieve a lot of stress from the process: The Jack Russell Lover's Ultimate Guide to Training comes complete with a full chapter on mix breeds.
Squirting dogs in the face
In puppy class we were taught to squirt water in the face of a dog to get them to stop an unwanted habit. It works on our one year old terrier mix Pepper. When she gets to rough with Sonny our (4 month old jack) or starts to bark and won't stop. Pepper was barking away and I sprayed and Sonny decided to join her so I squirted him in the face, he looked (with disdain) at me and barked again this went on a couple more times. He finally walked away to the far side of the room and laid down. Do Jacks hold grudges and is there a better way to stop unwanted barking?