Our nation's animals are getting fatter, just like we are. We've got some of the unhealthiest pets in Europe as a result of overfeeding and under exercise. Take a look at these chubby creatures and maybe you'll think twice about plying Butch with those extra Boneo's. 50% of dogs and cats in the UK are overweight, but 76% of owners think their pet is a healthy weight (Hill's pet research).