Most editing programmes will contain a 'clone' tool with which you can copy one part of an image and put it somewhere else. You can vary the size of the area you're copying so you can either do a big 'rough' job or a more detailed one using just small areas at a time selecting different areas to clone from to avoid making a repetitive 'pattern' appearing.
I've done a quick 'rough' one here so you can see what I've done - but I've also blurred the uninteresting road a bit and sharpened the dog to make it stand out more - again, I've 'over-cooked' it so you can see what's changed. You can do a much more subtle version so that it doesn't look as if anything has been touched on it.
I've used the 'magnetic Lasso' tool in 'Photoshop' to draw around the dog, then gone to 'select>inverse' which has selected the background where I've applied a generous amount of 'Gaussian blur' (Filter>blur>Gaussian blur). Going back to 'inverse' again, I've then applied 'unsharp mask' to just the dog.
You can see what I've done but, as I remarked, by using subtlety a photo will look quite natural without anyone suspecting anything has been altered!
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