From 4-Legger® - Makers of 4-Legger USDA Certified Organic Dog Shampoo

Ingredient Name
Natural or Synthetic?
How Safe Is It?
Can It Be Organic?
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Fir Essential Oil
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Steam distilled from the needles and twigs of the majestic balsam fir tree, this dog safe essential oil excels at relaxing muscles and reducing minor pain and inflammation. Rich in antioxidants it can help to fight free radicals that target the skin proteins, collagen, and elastin which protect the skin from damage. It also helps to clear away toxins that can clog pores and lead to skin issues. It is an uplifting oil that supports both physical and emotional health.

As with all essential oils, using a high grade essential oil that has been naturally extracted is imperative for the health and safety of your pet! 
Formaldehyde
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A known cancer causing preservative that is also linked with allergies and skin sensitivities. Slow releasing formaldehyde preservatives include
 
Diazolidinyl urea, Imidazolidinyl urea, DMDM hydantoin, and Quaternium-15.
Fragrance
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A "catch all" for added scent that generally means it has a lot of ingredients linked to allergies and immune issues.

Most have links to organ system toxicity and are not friendly to the planet (ecotoxicology).