Following information is from the following website:  

https://www.sitstay.com/blogs/good-dog-blog/essential-oils-for-dogs

Safe Essential Oils for Dogs

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• Lavender: Diffusing lavender has a calming effect on the central nervous system, and dogs experiencing separation anxiety may benefit from it. Universal oil, can use pure or diluted. Useful in conditioning patients to a safe space. May help allergies, burns, ulcers, insomnia, car ride anxiety and car sickness, to name a few.

• Marjoram: Marjoram is anti-fungal, anti-septic, and anti-bacterial. It may alleviate diabetes or depression symptoms, nerve pain, and assist with liver problems.

• Peppermint: Use peppermint topically or orally. It's anti-inflammatory, anti-septic, and analgesic.

• Sweet Orange: According to the Happy Healthy Pup Blog, Sweet Orange is deodorizing and deters bugs. Massage it on the stomach to relieve constipation symptoms in older puppies.

• Vetiver: The Whole Dog Journal suggests that Vetiver may reduce stress by calming dogs afraid of loud noises.

• Cardamom: Diuretic, anti-bacterial, normalizes appetite, colic, coughs, heartburn and nausea.

• Fennel: assists the adrenal cortex, helps break up toxins and fluid in tissue. Balances pituitary, thyroid and pineal glands.

• Helichrysum: Anti-bacterial, reduces bleeding in accidents, skin regenerator, helps repair nerves. Also useful in cardiac disease.

• Frankincense: Has helped some cases of cancer. Works on the immune system. Has reduced tumors and external ulcers. Increases blood supply to the brain (although it can worsen hypertension so use caution).

• Spearmint: Helps to reduce weight. Good for colic, diarrhea, nausea. Helps balance metabolism, stimulates gallbladder. When diluted and used short term, this oil is helpful for many gastrointestinal issues in cats.

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Additional List of safe essential oil for dogs:

• Angelica Root

• Basil

• Bergamot

• Black Pepper

• Cajeput

• Caraway

• Cardamom

• Carrot Seed

• Chamomile

• Cinnamon Leaf

• Cistus

• Citronella

• Coriander

• Cypress

• Elemi

• Eucalyptus

• Fennel (Sweet)

• Frankincense

• Geranium

• Ginger

• Grapefruit

• Helichrysum

• Lavender

• Lemon Citrus

• Lemongrass

• Mandarin

• Marjoram (Sweet)

• Melissa

• Myrrh

• Neroli

• Niaouli

• Nutmeg

• Opopanax

• Orange (Sweet, Blood)

• Palmarosa

• Patchouli

• Peppermint

• Petitgrain

• Plai

• Rosalina

• Rose

• Rosemary

• Sandalwood

• Spearmint

• Spikenard

• Tangerine

• Valerian

• Vanilla

• Vetiver

• Ylang Ylang

 

WHAT TYPES OF ESSENTIAL OILS ARE UNSAFE FOR DOGS?

Unsafe Oils for Dogs

According to The Bark, tea tree oil may be a bit too strong for dogs. NaturalNews reports that "There are some essential oils that should never be used for animals: Anise, Clove Leaf/Bud, Garlic, Horseradish, Juniper, Thyme, Wintergreen, or Yarrow, to name a few." If you're in doubt, call your veterinarian.

Here is a list of essential oils that could be unsafe for your dog.

• Anise (Pimpinella anisum)

• Birch (Betula)

• Bitter Almond (Prunus dulcis)

• Boldo (Peumus boldus)

• Calamus (Acorus calamus)

• Camphor (Cinnamomum camphora)

• Cassia (Cassia fistula)

• Chenopodium (Chenopodium album)

• Cloves (Syzygium aromaticum)

• Garlic (Allium sativum)

• Goosefoot (Chenopodium murale)

• Horseradish (Armoracia rusticana)

• Hyssop (Hyssopus sp. with the exception of Decumbens)

• Juniper (Juniperus sp. with the exception of Juniper Berry)

• Mugwort (Artemisia vulgaris)

• Mustard (Brassica juncea)

• Oregano (Origanum vulgare)

• Pennyroyal (Mentha pulegium)

• Red or White Thyme

• Rue (Ruta graveolens)

• Santolina (Santolina chamaecyparissus)

• Sassafras (Sassafras albidum)

• Savory (Satureja)

• Tansy (Tanacetum vulgare)

• Tea Tree Oil (Melaleuca alternifolia)

• Terebinth (Pistacia palaestina)

• Thuja (Thuja occidentalis)

• Wintergreen (Gaultheria procumbens)

• Wormwood (Artemisia absinthium)

• Yarrow (Achillea millefolium)