It may be hard to believe, but many manufactures still use formaldehyde based preservatives in dog shampoo.
Formaldehyde has ben linked to cancer, allergies and skin sensitivities.
You won't see the word, "Formaldehyde" in dog shampoo. You will likely see the slow releasing formaldehyde preservatives listed as one of these ingredients: Diazolidinyl urea, Imidazolidinyl urea, DMDM hydantoin, and Quaternium-15.
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