I would love some advice on the following. My two dogs are the best of friends. They are always together and sleep entwined. However they are jealous of each other getting attention. As soon as my hand goes out to pet one dog, the other is there too looking for attention. When I want to tell the dogs not to do something, the correction I use is an Ah Ah voice and a raised finger. Lila is very intelligent and needs very little in the way of correction, often just the finger and the slightest sound will do. She is very sensitive. Ron on the other hand is a big daft lump and not very bright. He needs a firmer sharper tone. I am working on the dogs sitting nicely when they want something. Lila has picked this up beautifully, Ron has kind of got the idea and often starts out sitting, but his exuberance tends to get the better of him and the paws come up. Unfortunately, when I correct Ron, Lila who will be behaving very well, thinks she is being corrected. Confusing for her. I try also to reward good behaviour with praise, of course, so when Lila comes and sits for something, I say good girl and pat her, but Ron sees this as his cue to bulldoze in! I would like to try to get on top of this before I get my new German Shepherd next weekend. I've been advised by someone who knows the shepherd that the correction he responds best to is a quick shake of a small plastic bottle filled with stones. However I'm really worried that this will upset Lila. I'd love to hear your thoughts.