# Can guinea pigs eat coltsfoot? > Better left off the menu. Verdict: avoid. Never · None — do not feed · fresh and raw only. Photo: Yellow coltsfoot flowers on stony ground. **Where sources disagree on this food:** > "All the rats in Group I survived beyond 380 days after the start of feeding and 8 out of 12 rats developed hemangioendothelial sarcoma in the liver" (PubMed (Gan), grade A) > "A review of the ethnobotanical value, phytochemistry, pharmacology, toxicity and quality control of Tussilago farfara L. (coltsfoot)." (PubMed (J Ethnopharmacol), grade A) > "Coltsfoot" (RVC Beaumont Sainsbury Animal Hospital, grade A) [minority position] We still give one verdict — rank the higher-graded sources first and never average the positions. The full resolution is in the sources section below. ## Quick answer No. Coltsfoot is the third plant where we overrule the RVC wild-herb list on toxicology grounds: a rat feeding trial of coltsfoot flowers produced liver hemangioendothelial sarcomas in 8 of 12 animals, with the carcinogenicity attributed to the pyrrolizidine alkaloid senkirkine (PMID 1269853). The standard Tussilago review carries a dedicated toxicity chapter (PMID 33069788). RVC's factsheet lists "Coltsfoot" among its safe Wild Garden Herbs/Weeds/Flowers — quoted verbatim in our sources section, then overruled. A plant whose flowers carry a documented carcinogenic PA does not become food because a safe list has not caught up. ## What the sources say about coltsfoot What the sources say: Merck's PA toxicosis page does not list the Tussilago genus, so coltsfoot's case rests on the feeding trial and the review literature rather than a manual entry — a weaker-looking register that still contains the only thing that matters: a same-material feeding trial producing tumours. The 2020 systematic review found the human case reports unreliable (PMID 32105669); the rat trial stands. What's missing: no feeding study of coltsfoot in guinea pigs exists — the PubMed hits for Tussilago plus guinea pig are tussilagone pharmacology papers, unrelated to feeding. A 2002 metabolism study models guinea pigs as effective detoxifiers of otonecine-type PAs like coltsfoot's (PMID 12437333) — an interesting cross-species extrapolation, and explicitly not safety evidence. Our recommendation: coltsfoot stays out of the cage. ## Pyrrolizidine alkaloids and guinea pigs What the sources say. Pyrrolizidine alkaloid (PA) poisoning is a documented cause of chronic, cumulative liver failure in cattle and horses, caused by a range of plants "most commonly of the genera Senecio, Crotalaria, Heliotropium, Amsinckia, Echium, Cynoglossum, and Trichodesma" (Merck Veterinary Manual, PA toxicosis page, last updated September 2024). Each of the three plants on this register carries its own measured or trial evidence: groundsel among the most PA-rich plants ever quantified (PMID 32870736), comfrey roots and leaves inducing liver tumours in every rat feeding group (PMID 278864), and coltsfoot flowers doing the same in 8 of 12 rats (PMID 1269853). What's missing. No feeding study of any of these three plants in guinea pigs exists — the searches are recorded on each page. Laboratory metabolism work shows guinea pigs detoxify most pyrrolizidine alkaloids faster than livestock species do (PMID 1907134; PMID 1440605), but that resistance is alkaloid-specific — jacobine, a major ragwort PA, is unusually toxic to guinea pigs (PMID 8591728) — and no safe feeding level has been established for any PA plant in this species. The 2020 systematic review of human case reports found that evidence unreliable (PMID 32105669); the animal trials stand. Our recommendation: none of the pyrrolizidine-alkaloid plants — groundsel, comfrey or coltsfoot — belongs in a guinea pig's food, whatever a wild-herb safe list says. This site owns that call; the RVC listings are quoted verbatim in the sources section of each page rather than quietly dropped. ## What to do instead Nothing to prepare — coltsfoot spreads by seed and rhizome and pops up on banks, wasteland and field edges in early spring, often before anything else is flowering. Pull it from reachable ground the way you would groundsel. If you forage, the cleared wild herbs on our register — dandelion is the classic early-spring yellow flower — fill the same slot. Dandelion is also the plant coltsfoot is most often confused with at a glance, which is one more reason to keep both straight. ## Who stands behind this verdict Written by [Patrick Li](/authors/patrick-li/). Editorially reviewed 2026-09-12 · Evidence checked 2026-09-12. Evidence: Sources disagree · Extrapolated from another species · Sources reach different conclusions. No veterinarian has reviewed this page. It is educational guidance checked by the author against the cited sources — for health decisions, talk to your vet. ## Wondering about these too? | Food | Verdict | How often | |---|---|---| | [Avens](/guinea-pigs/can-guinea-pigs-eat-avens/) | safe | A few times a week | | [Burnet](/guinea-pigs/can-guinea-pigs-eat-burnet/) | safe | A few times a week | | [Calendula](/guinea-pigs/can-guinea-pigs-eat-calendula/) | safe | A few times a week | **See also:** the [Food Checker](/guinea-pigs/what-can-guinea-pigs-eat/) photo wall covers every reviewed food with its verdict badge. ## Related tools - [Guinea Pig Vitamin C Calculator](/guinea-pigs/vitamin-c-calculator/): Guinea pigs need 10–30 mg of vitamin C every day because they cannot make or store it. Converts the daily vitamin C target into food and supplement portions by life stage. ## Frequently asked questions **Q: Can guinea pigs eat coltsfoot?** We recommend no. The rat feeding trial of the flowers produced liver tumours in 8 of 12 animals (PMID 1269853), the standard review treats toxicity seriously (PMID 33069788), and RVC's safe-list line is the single contrary voice — quoted on this page, then overruled. **Q: Can guinea pigs eat coltsfoot leaves if the flowers are the problem?** We don't recommend it. The carcinogenic PA senkirkine is the registered problem and the register gives no flower-only boundary; with the whole plant on warning, the leaf gets no pass. **Q: Is coltsfoot the same as dandelion?** No — they are unrelated plants with similar yellow flowers, and coltsfoot blooms before dandelion with flowers that appear before its leaves. Telling them apart matters in both directions: our register clears dandelion and overrules coltsfoot. **Q: What if my guinea pig ate coltsfoot?** Remove the plant and call your vet for advice, noting roughly how much and when. PA harm is cumulative rather than sudden; the practical job is making sure the access was a one-off. ## Safety notes Introduce any new food gradually: a small taste at first, building up over a week or so, and keep every serving fresh and raw. Hay stays the main event at around 80% of the day's eating, with fresh vegetables as the supplement. **Warnings:** - A rat feeding trial of coltsfoot flowers induced liver tumours in 8 of 12 animals, attributed to the pyrrolizidine alkaloid senkirkine (PMID 1269853). - RVC lists coltsfoot as a safe wild herb; this page keeps it off the menu anyway, and quotes the RVC listing in the sources section. **When to contact your vet**: Guinea pigs hide illness well. Contact your vet promptly if your guinea pig stops eating or passes fewer droppings, seems lethargic or in pain, has diarrhea, or shows any sudden change in behavior — small pets go downhill fast, and same-day advice is always the safe call. ## The sources behind this verdict 1. [PubMed (Gan): Carcinogenic activity of coltsfoot, Tussilago farfara L.](https://pubmed.ncbi.nlm.nih.gov/1269853/) (grade A, 1976-02). Scope: Rat feeding trial of coltsfoot flowers — the pivotal harm evidence. Excerpt: "All the rats in Group I survived beyond 380 days after the start of feeding and 8 out of 12 rats developed hemangioendothelial sarcoma in the liver" 2. [PubMed (J Ethnopharmacol): A review of the ethnobotanical value, phytochemistry, pharmacology, toxicity and quality control of Tussilago farfara L. (coltsfoot)](https://pubmed.ncbi.nlm.nih.gov/33069788/) (grade A, 2021-03). Scope: Toxicity chapter of the standard coltsfoot review. Excerpt: "A review of the ethnobotanical value, phytochemistry, pharmacology, toxicity and quality control of Tussilago farfara L. (coltsfoot)." 3. [RVC Beaumont Sainsbury Animal Hospital: Feeding Your Guinea Pig (factsheet PDF)](https://www.rvc.ac.uk/Media/Default/Beaumont%20Sainsbury%20Animal%20Hospital/EXOTICS/Animal%20Care%20Factsheets/Guinea-pig-feeding-guidelines-and-advice-Dec-2022-NS.pdf) (grade A, 2022-12). Scope: Wild Garden Herbs/Weeds/Flowers safe list — the single positive listing, quoted verbatim and overruled. Excerpt: "Coltsfoot" ### Where sources disagree > "All the rats in Group I survived beyond 380 days after the start of feeding and 8 out of 12 rats developed hemangioendothelial sarcoma in the liver" (PubMed (Gan), grade A) > "A review of the ethnobotanical value, phytochemistry, pharmacology, toxicity and quality control of Tussilago farfara L. (coltsfoot)." (PubMed (J Ethnopharmacol), grade A) > "Coltsfoot" (RVC Beaumont Sainsbury Animal Hospital, grade A) [minority position] How we resolved it: RVC (A) lists coltsfoot as a safe wild herb; against it stands the rat carcinogenicity trial of the flowers (PMID 1269853) and the toxicology chapter of the standard Tussilago review (PMID 33069788). Merck's PA genus list does not include Tussilago, so the case rests on the feeding trial, not Merck. No guinea-pig feeding study exists; the otonecine-type detoxification work (guinea pig as a model species, PMID 12437333) is an attributed cross-species extrapolation, not safety evidence. Verdict: avoid, with the RVC listing quoted verbatim as the overruled minority position. Grades rate the source, not the claim: S veterinary manuals · A research & university clinics · B welfare organizations · C practitioner education · D not cited. Methodology: /methodology/. Written by Patrick Li. This guide is informational and not a substitute for veterinary care. Canonical page: https://petguidecalc.com/guinea-pigs/can-guinea-pigs-eat-coltsfoot/