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Great shots John. To answer your question you need to make sure that the background is further away from the lights than the dogs. You want it to be 1/2 a stop darker so that there's separation. It looks like your lights are set quite high so that the angle is steep and the dogs and background are too close to the same distance from the lights. The result is that background is illuminated to the same extent as the main subject. The result is the whites are identical. Drop the lights and bring the dogs forward a bit and you'll start to see the separation you're looking for.
This is certainly colourful, but there isn't anything to rest the eye on. When you have an image our brains try to find something to concentrate our attention, in other words to be the focal point. Here we have bands of animals. So, while this is very interesting it won't attract many viewers I'm afraid.
A nice shot and well panned, but the camera has underexposed it because the car is white in bright sunshine. Increase the exposure by about a stop and you'll transform the image. I downloaded the image and changed the exposure. something between 2/3 and 1 Stop makes all the difference.