Ultraviolet light exposure is a well-established risk factor for dermal hemangiosarcoma in dogs, yet research on how to mitigate that risk,and whether sunscreen is safe for use in companion animals, has remained largely unexplored.
A 2026 review addresses this gap, summarizing the current evidence on UV-induced carcinogenesis in pets and evaluating the safety profile of common sunscreen ingredients.
The authors note that dogs with lightly pigmented skin, sparse fur, or habitually exposed areas such as the nose and ventrum are at elevated risk of UV-associated skin disease, including dermal HSA and squamous cell carcinoma. Environmental factors that heighten UV radiation exposure in humans like altitude, latitude, season, and reflective surfaces apply equally to companion animals, with Australian pets identified as particularly at risk given the country’s geographic and climatic profile.
While physical barriers such as shade and sun-protective clothing are recommended for high-risk animals, the authors argue these measures provide incomplete protection, particularly for anatomical areas where coverage is not feasible. Sunscreen is proposed as a necessary complementary strategy, though its use in veterinary medicine is complicated by a near-total absence of safety data.
The review evaluates two categories of UV filters. Organic (chemical) filters, several of which the FDA has declined to classify as generally safe even for human use, are considered difficult to recommend for pets given the increased risk of ingestion and transdermal absorption in dogs and cats relative to humans. Inorganic filters present a more nuanced picture.
Zinc oxide has been associated with toxicity in four documented cases where dogs repeatedly ingested rash creams containing high concentrations of the compound; however, the authors note that sunscreen formulations typically contain lower concentrations and dry more quickly, making ingestion substantially less likely. Non-nanoparticle zinc oxide is identified as the currently safest option, with the added practical benefit that its visible white film allows owners to monitor application persistence. Titanium dioxide is flagged as a potential alternative but offers narrower UV spectrum coverage and similarly lacks robust safety data in companion animals.
The authors call for urgent research into the efficacy and safety of sunscreen formulations in pets, and highlight that current regulatory restrictions in Queensland, where sunscreen testing on animals is effectively prohibited, represent a significant barrier to generating the evidence base needed to develop clinical guidelines.
For veterinary professionals, the review reinforces the importance of identifying high-risk patients early and counseling owners on UV reduction strategies, while being transparent about the current limits of the evidence.
