How to read a pet food ingredient list in Japan

Pet food sold in Japan is regulated under the Feed Safety Law (飼料安全法), which sets minimum standards for labelling but leaves considerable room for interpretation. Most owners read the guaranteed analysis panel and stop there. The ingredient list, which appears in descending order by weight before processing, tells a different story.

Why ingredient order matters ¶

Ingredients are listed by pre-processing weight, which means a food that lists 'chicken' first may contain less actual chicken protein than one that lists 'chicken meal' third. Chicken is roughly 70% water; chicken meal has had that water removed and contains approximately three times the protein by weight. Neither is inherently better, but understanding the difference changes how you read the list.

A food that lists three or four grain sources separately. Corn, corn gluten meal, corn starch, for example. May have more grain by total weight than the first-listed protein source. This is sometimes called ingredient splitting, and it is legal under current Japanese labelling rules.

Identifying filler ingredients ¶

The term 'filler' is informal, but it generally refers to ingredients that contribute calories without meaningful nutritional value for the target species. For cats, which are obligate carnivores, this includes most grain-based carbohydrates. For dogs, the picture is more nuanced: dogs can digest starch reasonably well, but a food that derives most of its calories from corn or wheat rather than animal protein is not optimally formulated for most life stages.

Artificial preservatives are a separate concern. BHA (butylated hydroxyanisole) and BHT (butylated hydroxytoluene) appear in some foods sold in Japan and are worth noting, particularly for animals with liver conditions. Mixed tocopherols (vitamin E) are the most common natural alternative.

What to ask when you are unsure ¶

If the ingredient list is unclear, the most useful question to ask a specialist retailer is: what is the primary protein source by dry weight, and how is it verified? A retailer who can answer that question has done the work. One who cannot is selling on packaging rather than content.

At Solar Pioneer, every food product on the floor has been reviewed at ingredient level before ordering. If you bring in a food you are currently using, we can go through the list with you and identify anything worth discussing with your veterinarian.

Ingredient literacy takes time to develop, but even a basic understanding of how lists are structured changes what you notice on the shelf.