The findings, published in Scientific Reports, highlight how pet owners can feed their animals more sustainably while still providing them with sufficient nutrients and calories.
Marcio Brunetto and colleagues evaluated the environmental impacts including greenhouse gas emissions, land use, and water usage of 618 diets for dogs and 320 diets for cats in Brazil. The authors investigated commercial wet diets and dry diets found on the websites of three major Brazilian pet food retailers.
These were also compared to homemade diets - either food produced by companies, or food cooked by owners at home using recipes provided by companies. Additionally, the authors assessed the nutritional and calorific makeup of the different diets.
For all variables, wet diets for cats and&nbsp;dogs had the greatest environmental impact, particularly compared to dry diets. Homemade diets tended to have intermediary environmental impacts, although water usage in homemade cat diets was similar to dry diets.
Dry diets provided the highest amount&nbsp;of energy per gram, while wet diets and homemade diets provided higher amounts of protein. In wet diets, almost twice as much energy was provided by animal ingredients compared to dry diets.

Environmental impact can be reduced by feeding dry food to pets: Research

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