CBG

CBG for Dogs, Cats and Horses: What the Mother Cannabinoid Is and What the Research Shows

CBG (cannabigerol) is a non-intoxicating cannabinoid in hemp, nicknamed the "mother cannabinoid" because its acidic form, CBGA, is the molecule the plant converts into CBD, CBC and THC as it matures. Very little is left at harvest, so in a pet product CBG almost always arrives as a small part of a full-spectrum hemp extract rather than on its own. It will not get a dog, cat or horse high.

This page is written for owners who have seen "CBG" on a label or a lab report and want to know three things: whether it is safe for their animal, how much is reasonable, and whether it does anything CBD does not. The honest answers are: the canine safety data is better than most people realise, the amount question has a clear answer, and the "does it do more" question does not yet.

CBG vs CBD: Same Plant, Different Molecules

Both are cannabinoids from the same hemp plant, both are non-intoxicating, and both interact with the endocannabinoid system. The differences that matter to an owner:

• Abundance. CBD is the dominant cannabinoid in hemp at harvest; CBG is a minor one, typically a few percent of the CBD figure on a certificate of analysis.

• Origin. CBGA is the parent acid; the plant's enzymes turn most of it into CBDA, THCA or CBCA. What remains as CBG is the leftover.

• Receptor activity. In laboratory work CBG shows a different receptor profile from CBD, including activity at the CB1, CB2 and alpha-2 adrenergic receptors. Whether those differences translate into different effects in a dog has not been tested in any published trial.

• How fast it clears. In the one canine pharmacokinetic study, CBG peaked in the blood within about an hour and had an elimination half-life of roughly two hours — faster than CBD, which is one reason the study authors dosed it twice daily.

So CBG is not "stronger" or "weaker" than CBD. It is a different compound that, in a whole-plant extract, rides along with CBD in the ratio the plant produced. Our hemp oil vs CBD oil for dogs guide covers how to read the rest of the label.

What the Dog Studies Actually Show

Most CBG pages say "research is early" and stop. There are, in fact, three published canine studies that include CBG or CBGA, all in healthy beagles, all funded by a cannabinoid manufacturer — which is normal for this field and worth knowing when you read them.

• Amstutz et al., 2022, Journal of Veterinary Pharmacology and Therapeutics. Six male beagles were given 2 mg/kg of a CBG and CBGA extract twice daily for two weeks, fasted and then fed. CBG peaked at 39–55 ng/mL within an hour and cleared with a half-life of about two hours; CBGA reached far higher blood levels (1,600–2,200 ng/mL). Feeding made no statistically significant difference. The only adverse event was one dog vomiting once. The liver enzyme ALP fell slightly over the two weeks, the opposite of what several CBD studies have reported, and the authors concluded both compounds "appear to be safe upon short-term evaluation."

• Bookout et al., 2024, Frontiers in Veterinary Science. Thirty-two beagles, four groups of eight, 90 days at 5 mg/kg/day of total cannabinoids, then two weeks off. One group received CBD and CBG in a 1:2 ratio. No adverse events were recorded in any group. The CBD-only group showed a rise in ALP versus controls at days 28, 56 and 90 (one dog went above the reference range); the CBD+CBG group did not differ from controls on ALP, though its ALT readings differed on some days while staying inside the normal range. Occasional hypersalivation was noted in the CBG group. The authors judged none of it clinically relevant and concluded the products "do not pose significant risk to dogs in long-term use." The study was funded by the National Animal Supplement Council.

• Koll et al., 2026, Frontiers in Veterinary Science. Eight beagles, 90 days, twice-daily softgels delivering about 1 mg/kg each of CBDA and CBGA. Blood counts and chemistry stayed within reference ranges throughout; the dogs gained a little weight; occasional vomiting and loose stool occurred at the colony's normal rate. Both acids were absorbed, and the authors reported unexpectedly high exposure to the minor acids THCA and CBCA as well.

Read together: at research doses several times higher than a typical supplement serving, CBG and CBGA have been well tolerated in healthy dogs for up to 90 days, with no published signal of harm. What none of these studies did is test whether CBG helps with anything — they were safety and absorption studies. Any page that cites them as proof of a benefit is misreading them. The primary sources are the 2024 safety study on PubMed Central and the 2026 CBDA/CBGA study in Frontiers.

Is CBG Hard on the Liver?

This is the question owners ask most, because it is the known concern with CBD: several canine CBD trials have recorded a rise in alkaline phosphatase (ALP), a liver enzyme, usually mild and usually without clinical signs. The CBG-specific data is more reassuring than the CBD data, with a caveat.

In the 2022 two-week study, ALP went down on CBG/CBGA, not up. In the 2024 90-day study, the CBD+CBG group showed no ALP difference from the untreated controls, while the CBD-only group did. The authors speculated that CBG and CBD may act differently on the liver's cytochrome P450 enzymes, but said plainly that there is no further evidence either way. The caveat: six and eight dogs, all young and healthy, over weeks not years. A dog with existing liver disease has never been studied, and a dog on any medication processed by the liver needs the vet's view before adding hemp of any kind. We go through the published interaction findings in hemp and your dog's medications.

How Much CBG Should a Dog Have?

Two different numbers get mixed up here, and separating them answers the question.

• The research dose. The dog studies used 2 mg/kg twice daily (2022) and 5 mg/kg/day of total cannabinoids (2024). For a 50-lb dog that is roughly 45–115 mg of cannabinoids a day — a deliberately high amount chosen to look for problems, not a feeding recommendation.

• A supplement serving. In a full-spectrum product, CBG is not dosed separately. You serve the oil by the animal's body weight, and the CBG arrives in whatever proportion the batch contains — our certificates of analysis list it per batch. The serving-by-weight guide is the number to use; start at the low end for a week and adjust from there.

• If you are buying a "CBG oil." Products sold as CBG-forward typically state CBG per mL on the label. Treat the per-kg figures above as the ceiling the safety data covers, not a target, and confirm the per-mL claim against the product's own lab report rather than the front of the bottle.

Two timing details from the 2022 study are useful at home: CBG was absorbed whether the dogs were fed or fasted, so it does not need an empty stomach, and it clears in a few hours, so a morning-and-evening split is more sensible than one large serving.

Side Effects and When to Call the Vet

Across the three studies, the recorded effects were a single episode of vomiting, occasional drooling, and loose stool at the rate the colony normally shows. With any hemp product the practical list is the same: a little drowsiness, a soft stool, or a dog who seems "off" for an hour or two, all of which usually resolve by lowering the amount.

• Call the vet before starting if your dog has liver or kidney disease, is pregnant or nursing, or takes any medication — especially sedatives, anti-seizure drugs, blood thinners, or anything your vet has told you is processed by the liver.

• Call the vet the same day if you see repeated vomiting, marked lethargy, wobbliness, or dribbling urine. Those are not CBG effects; they are the signs of THC exposure, which means the product is not what the label says, or the dog got into something else. Cannabis toxicity vs hemp has the full picture.

• Ask for a liver panel at the next routine visit if your dog is on daily hemp long-term. It is cheap, and it turns a theoretical worry into a number.

Every published side-effect finding for hemp in dogs is collected in hemp and CBD side effects in dogs.

CBG for Cats and Horses

There is no published CBG-specific study in cats or horses — every CBG data point above is from beagles. What exists is species data on hemp extract generally. Cats clear cannabinoids more slowly and reach lower blood levels than dogs at the same serving, and some carriers and essential oils in "pet" products are unsafe for them; our cat safety entry and cats process hemp differently cover that. For horses, the Tarleton State work on our own formula measured CBD, not CBG, and the drug-testing rules under USEF and FEI apply to all cannabinoids, CBG included — see hemp for horses. In both species, the CBG in a full-spectrum oil is served by weight along with everything else in the bottle; there is no reason, and no evidence, to seek it out separately.

How to Choose a Product With CBG In It

• Read the certificate of analysis, not the label. A real full-spectrum extract shows CBG (and often CBGA, CBC and CBDA) as separate lines on the lab report. If the report lists only CBD, it is an isolate or a broad-spectrum product regardless of what the front says. Ours are published at lab results.

• You do not need a "CBG-only" bottle. The one canine study that fed CBG on its own still used it alongside CBGA, and no study has compared isolated CBG with a whole-plant extract in dogs. Buying CBG as an add-on to a product you already use mostly adds cost.

• Check what else is in it. Many "calming" products that mention CBG also contain melatonin, L-tryptophan or valerian. That is fine if you know, and a problem if you are also giving those separately or if the animal is a cat.

• Look for the usual quality markers. Batch-specific third-party testing, a THC figure under 0.3%, a stated mg per mL, and a company that can tell you where the plant was grown. The certificate of analysis entry explains how to read one.

Where HempMy Pet Stands

We have never sold a CBG isolate and do not plan to. Our full-spectrum oils contain CBG in the proportion our own Colorado-grown hemp produces, alongside CBD, CBC, CBDV and the plant's terpenes — that whole-plant combination is the entourage effect argument, and it is also simply what a gentle extraction of a good plant gives you. Our own 90-day trial of 37 dogs with chronic joint discomfort tested that whole oil, CBG included: of the 32 dogs that completed it, 30 showed a benefit on veterinary assessment and 94% of owners reported improved quality of life. It was a trial of the full extract, so it says nothing about CBG on its own — and we would rather say that than imply otherwise. The oils are at hemp oil for dogs, hemp for cats and hemp for horses.

Frequently Asked Questions

Is CBG the same as CBD? No. They come from the same plant and neither is intoxicating, but they are different molecules. CBGA is the parent compound the plant converts into CBD; the small amount of CBG left at harvest is what ends up in a full-spectrum extract. In dogs CBG is absorbed and cleared faster than CBD, and laboratory work shows a different receptor profile. Whether that produces a different effect in a pet has not been tested.

Is CBG hard on the liver? The dog evidence so far says no, with limits. In a two-week study ALP fell on CBG/CBGA, and in a 90-day study the CBD+CBG group showed no ALP difference from untreated controls while the CBD-only group did. Those are small studies in young healthy beagles. A dog with liver disease has not been studied, and any dog on liver-processed medication needs a vet's opinion first. A routine liver panel is a sensible check for any dog on daily hemp.

Which CBD is the safest for dogs? The one with a batch-specific third-party lab report that matches the label, THC under 0.3%, no xylitol, no essential oils, a stated mg per mL, and a company that can tell you where the hemp was grown. Full-spectrum extracts containing CBG have 90-day canine safety data behind them; isolates and broad-spectrum products have less. Safety is about the product's quality control far more than about which cannabinoid is in it.

What drugs should not be taken with CBD or CBG for dogs? Anything processed by the liver's cytochrome P450 enzymes deserves a conversation with the vet, because cannabinoids can change how quickly those drugs clear. The ones that come up most are anti-seizure medications, sedatives such as trazodone, blood thinners, some heart medications and NSAIDs. The canine interaction research is summarised in our medication-interactions guide; the short version is tell the vet everything the dog takes, supplements included, and do not stack sedating products.

Can dogs have CBG? Yes. Three published studies have given CBG or CBGA to healthy dogs for two weeks to 90 days at doses well above a typical supplement serving, with no adverse events beyond a single episode of vomiting and some drooling. In a full-spectrum oil a dog gets CBG automatically, served by body weight.

What is the CBG dosage for dogs? CBG is not dosed separately in a full-spectrum product — you serve the oil by weight and the CBG comes with it. The research doses, 2 mg/kg twice daily and 5 mg/kg/day of total cannabinoids, are safety-study amounts, not a feeding recommendation. If a product states CBG per mL, follow its label, start low, and keep the research figures in mind as the ceiling the safety data covers.

Is CBG good for dogs? It is well tolerated in dogs, and that is as far as the evidence goes. No published trial has tested whether CBG improves anything in a dog. Where full-spectrum hemp as a whole has canine trial evidence is joint comfort; CBG is one component of the extracts used in those trials, not the tested variable.

What is the best CBG for dogs? A full-spectrum hemp extract whose lab report shows CBG as a separate line, from a company that grows or at least traces its own hemp, with a THC figure under 0.3% and no additives the species cannot tolerate. There is no canine evidence that a CBG-forward or CBG-isolate product does more than a good full-spectrum oil, so paying extra for "more CBG" is paying for a number nobody has shown to matter.

CBG vs CBN for dogs — what is the difference? CBG is the parent cannabinoid, present in small amounts in fresh hemp. CBN forms when THC degrades with age, light and heat, and it is marketed for sleep — a claim the research does not support in dogs or people. CBG has two-week and 90-day canine safety data; CBN has no canine studies at all. See our CBN entry for the detail.

Can cats and horses have CBG? There is no CBG-specific study in either species. Cats and horses do receive CBG as part of full-spectrum hemp products, served by weight, and the general species cautions apply — slower clearance and carrier safety in cats, competition drug rules in horses. Treat the dog data as the only direct evidence and go conservatively.

Can I give my dog CBG and CBD together? Yes — in a full-spectrum oil that is exactly what happens, and the 90-day dog study that included a CBD+CBG group recorded no adverse events. Serve by weight, start low, and do not add a separate CBG product on top without counting the total.

Related Terms

CBD · CBDa · CBC · CBN · CBDV · Full-Spectrum Hemp Extract · Entourage Effect · Endocannabinoid System · Certificate of Analysis · Browse the full Encyclopedia

Written by Marc Brannigan, Co-Founder & CEO of HempMy Pet. Marc co-founded HempMy Pet in 2016 with his business partner Natalie Mondine, the company's COO. HempMy Pet breeds its own hemp genetics, grows them on its certified-organic Colorado farm, and formulates every batch in-house under human-grade standards. Every batch is third-party tested, and the company's 90-day dog study was overseen by Dr. Robin Downing, DVM, MS with Colorado State University researchers. This entry is general information, not veterinary advice. Last updated 17 October 2026.