Here is some information from Angela Newsom, “EO Vet Page” that I follow.

Geranium, or Pelargonium graveolens, has been used historically for supports a “healthy inflammatory response”, “promotes healing”, “supports hormones”. It has been used for centuries as a perfume due to its strong floral aroma. Geranium has cleansing and outdoor properties. This EO has been studied extensively in animals and it is safe to use on all species. I do recommend starting out with it diluted on small animals like dogs, cats or pocket pets. It can be applied topically, blended with other oils, or diffused. Internal use is generally not indicated with this essential oil.

Geranium Essential Oil is one to consider animals and if you have an emergency kit.
This oil has an exceptional ability to support tissue health. This makes it a favorite for your first aid box. It is helpful after an animal has a failed pregnancy. It is a go-to oil for the outdoors. It is supportive of the organs and liver detoxification. A sesquiterpene alcohol from this EO is a great one to add to your home made outdoor sprays!

This oil is amazing for emotional support as well. Not only does it help with the physical aspects of hormonal imbalance, but it can help with nervous tension, anxiousness, feelings of abandonment or distrust, and it promotes feelings love and forgiveness. It has been said to help release negative memories and reinforce peaceful joy.

This oil can be blended with many other oils including lavender, marjoram, frankincense, myrrh, or helichrysum.

Dogs: Dilute 1 drop EO in 25-50 drops carrier oil for topical application
Cats: Dilute 1 drop EO in 50-85 drops carrier oil for topical application
Birds: Dilute 1 drop EO in 4 oz. (120 mL) or distilled water and use as a feather mist
Pocket Pets: Dilute 1 drop in 100 drops of carrier oil or use water diffusion
Goats, Sheep, Horses, cattle, and other large animals: 1-6 drops topically along the spine or directly on area of concern, no dilution necessary (start with 1 drop with goats/ sheep).