There's all sorts of advice on this on the web and I had no joy with most of it. The best I managed was to stop the flower beds being used as the toilet. Then, as the months went by, she got into a routine and luckily her preferred spots were acceptable. By the way a bored dog does more damage (digging, running around in the winter ripping up sods with her claws as she corners at speed etc) to a garden than dog poo so make sure your pups get plenty of exercise. Also young pups will chew anything they can get their teeth into, decking, garden furniture so I'd recommend plenty of chew toys and unless you have angels giving them bones as treats will only result in hole digging. Best of luck.