Usually, a dog jumps for one or more of these reasons:
Watch your dog when he is in the yard. Dogs are less inclined to jump fences if there's something to do or someone they like in the yard. And naturally, when you are present, you can distract the dog away from the fence or verbally or physically deter his at the first sign of his having thoughts about jumping the fence.
Make sure your dog is getting enough physical exercise as well as attention from people. Often, it is lack of attention that leads to a dog trying to escape a yard. Take the time to teach your dog to respect the boundaries of the yard. Whenever you see him sniffing the fence line, starting to dig, or contemplating jumping the fence, jump into action yourself and discourage these behaviours.
Channel the dog's energy into activities that take place away from the fence. Throw a ball or frisbee, and frequently praise the dog for getting the ball and returning to you. If he approaches the fence, regain his attention immediately, and when he looks at or comes to you, praise him right away and resume playtime. Remember that for most dogs, playing is a highly motivational treat. It can help to pair the verbal and play reinforcement with little food treats.
Use voice and body to discourage the dog from going near the fence and thinking about jumping the fence. Distract him whenever he gets near the fence, and draw the dog back to you. For greater effectiveness and positive reinforcement, reward the dog for any responsive behaviour, such as stopping and looking at the person when his name is called. Carry a pocketful of treats. Your goal is to interrupt the dog's thoughts about escape, and to get the dog to realize, 'it's more fun to stay near my person.'
Here are a few suggestions to prevent your dog even being able to jump the fence.
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