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Aromatherapy & behavior<\/span><\/p>\n Aromatherapy in animals is more than a pleasant smell. Smell is the shortest route to the limbic system, the part of the brain that controls fear, emotions and stress hormones. But how does that work exactly, what are the dangers in cats, and which oil works best for which problem? <\/p>\n By Stefan Veenstra DVM \u2014 Integrative veterinarian, founder NGD Care & NatuurlijkGezondeDieren.nl<\/p>\n<\/div>\n <\/p>\n <\/p>\n Of all the senses, the sense of smell is the most direct connection to the emotional brain. When a dog or cat ingests a scent, the molecules travel through the nasal cavity to the olfactory epithelium, where they bind to receptors of the olfactory nerve. This nerve runs directly to the olfactory bulb, which is directly connected to the amygdala and the hippocampus: the nuclei of the limbic system. <\/p>\n This is fundamentally different from other senses. Visual and auditory stimuli are first processed in the thalamus before they acquire emotional significance. Scent skips that intermediate step. A scent stimulus reaches the amygdala, the fear center of the brain, faster than the conscious brain can register that there is a smell. This is exactly why aromatherapy for fear responses is neurologically useful: it works on the same system that controls the fear, before cognitive processing kicks in. <\/p>\n In dogs, this effect is extra strong. A dog’s olfactory epithelium is 30 to 40 times larger than that of a human, with a multitude of receptor cells. In cats, the sense of smell is also exceptionally refined and smell plays a central role in emotional processing, territorial behavior and social communication. <\/p>\n The HPA axis and aromatherapy<\/strong> <\/p>\n How an oil is administered determines the route through which the effect occurs, how fast it works and how strong the systemic uptake is. The four forms of administration each have their own profile. <\/p>\n A diffuser diffuses microscopic oil droplets into the air. Volatile components are absorbed via inhalation through the nasal mucosa, with direct limbic activation via the olfactory bulb. Systemic uptake through the lungs is low at normal diffuser concentrations: most components do not reach the bloodstream at relevant concentrations along this route. <\/p>\n The mechanism of action is primarily olfactory: rapid effect on anxiety and mood via direct amygdala activation, but no significant pharmacological action at the organ level. The advantage is that the entire living environment is supported, including for housemates. The disadvantage is that the animal has no control over the exposure. <\/p>\n Indications:<\/strong> chronic background stress, overstimulated environment, recovery after a busy day. A roller contains the oils diluted in carrier oil (jojoba, fractionated coconut oil) and is applied directly to the skin. This provides a dual mechanism of action: the olfactory component activates the olfactory system while the animal sniffs or is close to it, while lipophilic active substances are absorbed through the skin and enter the bloodstream. <\/p>\n Percutaneous absorption depends on the application site. On thin skin with good blood circulation, such as the inside of the ears, paw pads and groin, the absorption is best. Beta-caryophyllene (copaiba) and linalool (lavender) are well documented in terms of transcutaneous absorption. <\/p>\n Indications:<\/strong> acute moments of stress, use on the road, at the vet, daily use in case of chronic tension. Sprays are used for two purposes: on the coat or skin (Itch Support, flea sprays) or in the environment (baskets, pillows, car). With skin sprays, both olfactory and percutaneous absorption occurs, similar to the roller but over a larger surface area with lower concentrations per cm\u00b2. <\/p>\n With insect repellent sprays, the mechanism is different: the scent components disrupt the orientation behavior and the olfactory receptors of insects, without affecting the nervous system of the animal. Components like PMD (lemon eucalyptus), eugenol (cloves), and cedrol (cedarwood) have been documented to be effective as insect orientation confusions. <\/p>\n Indications:<\/strong> itching and skin irritation, flea and tick repellent, environmental treatment. Oral essential oils (Intense Parasite Guard, Gentle Parasite Guard, Microbe Guard Internal) are administered over the feed or directly. Active components are absorbed into the bloodstream via the mucosa of the gastrointestinal tract and reach systemically higher concentrations than via inhalation or skin. This makes oral administration the strongest but also the most burdensome administration path. <\/p>\n Phenol-rich oils such as oregano (carvacrol) and thyme (thymol) can irritate the stomach mucosa or burden the liver if the dosage is incorrect. Solution in MCT oil significantly improves tolerability and absorption. Lemon oil in Microbe Guard Internal supports liver metabolization of the phenolic components. <\/p>\n Indications:<\/strong> parasitic support, microbial imbalance, systemic antimicrobial support. <\/p>\n Cats are not small dogs. Their liver metabolism differs fundamentally from that of dogs and humans in one crucial respect: cats lack the enzyme glucuronyl transferase, which is responsible for glucuronidation. This is the detoxification pathway by which many terpenes, phenols, and other organic compounds are linked to glucuronic acid so that they become water-soluble and can be excreted. <\/p>\n This means that substances that dogs and humans break down and excrete quickly can accumulate in the bloodstream to toxic concentrations in cats. This is not a dosage problem that you solve by giving less: it is an absent metabolic pathway that is structurally unavailable in cats. <\/p>\n Never use directly on cats:<\/strong> tea tree (melaleuca), eucalyptus, peppermint in high concentrations, cloves (eugenol), cinnamon, oregano, thyme (thymol), and any oils with high phenolic or monoterpene content without specific cat formulation. Symptoms of toxicity in cats: salivation, vomiting, ataxia, tremors, difficulty breathing. If exposure is suspected: go to the vet immediately. <\/p>\n<\/div>\n Safe for cats (when used correctly)<\/strong><\/p>\n Anxiety Support (low concentration, ventilation), Gentle Flea & Tick Guard, Gentle Parasite Guard, Grief Support, Itch Support, Stress Support (diffuser with ventilation), Grounding Support (diffuser with ventilation)<\/p>\n<\/div>\n Not for cats<\/strong><\/p>\n Intense Flea & Tick Guard (direct on cat), Intense Parasite Guard, Microbe Guard Internal, products with high phenol-rich oils in concentrated form<\/p>\n<\/div>\n Diffuser use in cats: additional rules<\/strong><\/p>\n Always well-ventilated space. Maximum 20 to 30 minutes per session. Cat should always be able to leave. Never diffuse in an enclosed room at night. <\/p>\n<\/div>\n Hydrosols: different story<\/strong><\/p>\n Lavender hydrosol (base of Gentle Flea & Tick Guard) contains no free terpenes and is safer for cats than pure oils. This principle underlies the entire Gentle-line. <\/p>\n<\/div>\n<\/div>\n Study<\/span><\/p>\n Merola & Dunayer (2006)<\/strong> \u2014 Review article on toxicity of essential oils in cats and dogs. Cats showed significantly higher sensitivity to terpene- and phenol-rich oils due to deficient glucuronidation. Veterinary Medicine<\/em>, 101(10):718-721. <\/p>\n<\/div>\n Study<\/span><\/p>\n Khan et al. (2014)<\/strong> \u2014 Tea tree toxicity in cats by topical application: case series with neurological symptoms and liver enzyme elevation. Journal of Veterinary Emergency and Critical Care<\/em>, doi:10.1111\/vec.12128.<\/p>\n<\/div>\n <\/p>\n Not all essential oils work through the same mechanism. The pharmacologically most relevant components in the NGD Care stress and anxiety blends: <\/p>\n A sesquiterpene with selective CB2 receptor activity. The endocannabinoid system regulates pain, anxiety, inflammatory response, and stress reactivity. Beta-caryophyllene is the only GRAS-recognized component of essential oils with direct cannabinoid activity, without psychoactive effect. Shown to be effective in reducing fear and stress response in multiple animal models. <\/p>\n<\/div>\n Linalool modulates GABA-A receptors in a similar way to benzodiazepines, but without the addiction potential and sedative side effects. GABA is the main inhibitory neurotransmitter in the central nervous system. Linalyl acetate has additional spasmolytic and anxiolytic action. In dogs, significant reductions in stress behavior have been described after lavender inhalation in a kennel environment. <\/p>\n<\/div>\n Cedrol increases GABAergic activity and decreases locomotor activity in animal models. Sesquiterpenes from vetiver (khusimol, isovalencenol) have a strong grounding and parasympathetic activating profile via olfactory modulation of the autonomic nervous system. Alpha-santalol from sandalwood directly affects the limbic system and promotes inner silence. <\/p>\n<\/div>\n Incensol acetate crosses the blood-brain barrier and has demonstrated anxiolytic and antidepressant properties via activation of TRPV3 channels in the brain. Alpha-pinene inhibits acetylcholinesterase, which contributes to cognitive integration. Frankincense is included in multiple NGD Care blends as the regulatory and integrative oil that harmonizes the overall response. <\/p>\n<\/div>\n Study<\/span><\/p>\n Lopresti et al. (2022)<\/strong> \u2014 Systematic review: linalool and lavender in anxiety. Significant reduction via GABA-A modulation in human and animal models. Phytotherapy Research<\/em>, doi:10.1002\/ptr.7325. <\/p>\n<\/div>\n Study<\/span><\/p>\n Moussaieff et al. (2008)<\/strong> \u2014 Incensol acetate from Boswellia sacra: anxiolytic action via TRPV3 activation, independent of benzodiazepines. FASEB Journal<\/em>, doi:10.1096\/fj.07-101915.<\/p>\n<\/div>\n <\/p>\n The NGD Care stress and anxiety line includes several products, each with its own accent. The table below shows at a glance which product is primary for which symptom and which can be used additionally. <\/p>\n Primary<\/strong> = for which the product has been specifically developed. Supportive<\/strong> = additional use, not the first choice for this symptom.<\/p>\nEssential oils in dogs and cats:
\n mechanisms of action, safety and which oil for which symptom<\/span><\/h1>\nWhy smell acts directly on the nervous system<\/h2>\n
\nStress activates the hypothalamic-pituitary-adrenal axis (HPA axis), leading to cortisol release. Chronically elevated cortisol damages the hippocampus, disrupts the gut barrier, and amplifies fear reactivity in a self-reinforcing circle. Aromatherapy can modulate the HPA axis at the sensory level via limbic activation, but is insufficient if the biochemical basis of chronic stress is not addressed. For structural support of anxiety and chronic stress, the NGD Care Behavioral Protocol<\/a> is the right starting point, with essential oils as the sensory supplement. <\/p>\n<\/div>\nForms of administration and their mechanism of action<\/h2>\n
Diffuser: environmental support via inhalation<\/h3>\n
\nRules:<\/strong> always sufficient ventilation, animal must be able to leave the room, never continuously all day, maximum 30 to 60 minutes per session.<\/p>\n<\/div>\nRoller: targeted and fast through skin and fragrance combined<\/h3>\n
\nRules:<\/strong> avoid eyes, mucous membranes and broken skin. For cats: always check for cat safety. <\/p>\n<\/div>\nSpray: wide spread on fur or environment<\/h3>\n
\nRules:<\/strong> do not spray towards the face. After flea spray: do not go into the water for the first two hours, do not spray near open water. <\/p>\n<\/div>\nOral: systemic action via gastrointestinal tract<\/h3>\n
\nRules:<\/strong> always stick to use-rest schedule (max. 1 week consecutively for strong blends). Not for cats unless specifically formulated. <\/p>\n<\/div>\nDangers in cats: the glucuronidation gap<\/h2>\n
The active components: what happens in the brain?<\/h2>\n
Beta-caryophyllene (copaiba)<\/h3>\n
Linalool and linalyl acetate (lavender, bergamot, Roman chamomile)<\/h3>\n
Cedrol and sesquiterpenes (cedarwood, vetiver, patchouli, sandalwood)<\/h3>\n
Incensol acetate and alpha-pinene (frankincense)<\/h3>\n
Which stress-related oil for which symptom: the decision aid table<\/h2>\n