In the EU, the legal basis for "organic" claims on food (including pet food that markets organic ingredients) is Regulation (EU) 2018/848 of the European Parliament and of the Council on organic production and labelling of organic products. It replaces / repeals Council Regulation (EC) No 834/2007.
An "organic" label claim in the EU is therefore not defined by general feed law but by this dedicated organic-production regulation; a pet food bearing an "organic" claim must comply with its production and labelling rules (e.g., permitted substances, certification, and the conditions under which the term "organic" may appear on the label).
Scope note: verify pet-food-specific provisions within the regulation before asserting detailed requirements; this topic records the regulation's identity and that it governs organic production and labelling.
Source: pdf-raw/label-claim/eu_2018_848.html (EUR-Lex Regulation (EU) 2018/848, first-hand).
Claims (verified C1 substrings of source_file)
Regulation (EU) 2018/848 on organic production and labelling of organic productsorganic production and labelling of organic products and repealing Council Regulation (EC) No 834/2007