Cats and dogs are passionate carnivores, while their food is often wrapped in plastic packaging – a worrying fact for shoppers concerned about sustainability. Pet owners can act to mitigate the environmental impact, says Kathrin Irgang, a Berlin veterinarian who provides nutritional counselling for small animals. Pet food is often packed in plastic, why is that? And are there alternatives? Kathrin Irgang: It is not easy to package pet food. Dried food, for example, is sprayed with fat so you can’t put in simple paper bags. But there is now food in paper bags with compostable film and treat bis…