Understand cleansing ingredients, preservatives, fragrance claims and skin measurements. Start with a question below; each note gives a practical guide and the sources behind it.
A number on a shampoo bottle and a reading taken from your dog's skin answer different questions. Use this note to understand what was measured before deciding what the result means.
Surfactants are cleansing ingredients. A long or unfamiliar name is a starting point for understanding the formula, not a shortcut to deciding whether the shampoo is gentle.
Preservation is how a product is protected from unwanted microbial growth. The ingredient list shows only part of that system; packaging, manufacture and testing belong in the explanation too.
Words such as Parfum and linalool can look like answers to a safety question. Start with the smaller question they can help answer: what does the label say about scent ingredients?
You do not need to read a research paper before every purchase. Start by making the promise specific enough to check. 'Gentle' on its own leaves much more unanswered than it appears to.
Tables of claims, product formats and skin contact, with data downloads.
Read as much detail as you need. The practical guide helps you use the explanation; examples show how to read a label or study. Numbered links lead to the sources, with a note on what each can and cannot answer.
The notes do not diagnose, score products, certify safety or replace veterinary or legal advice. You can also open the archived English research PDFs and the three supporting datasets.
What you are reading
Practical guides with sources you can check
The web pages include practical reading guidance alongside the research. The PDFs preserve the English research edition from August 2026 and do not contain later reading-guide additions. These notes explain selected evidence; they are not systematic reviews, meta-analyses, product verdicts or veterinary review.