If you cover more than 12,000 miles a year, a diesel makes sense. Otherwise, we'd recommend a petrol or hybrid for your driving. A Skoda Superb Estate could be a good choice - it's very comfortable and popular with dog owners due to its huge boot. You could also look at the slightly smaller (but still very practical) Octavia. Alternatively, the Vauxhall Insignia Sports Tourer represents excellent value for money on the used market.