{"id":38722,"date":"2025-06-06T00:01:56","date_gmt":"2025-06-06T04:01:56","guid":{"rendered":"https:\/\/beyondpesticides.org\/dailynewsblog\/?p=38722"},"modified":"2025-06-05T16:12:11","modified_gmt":"2025-06-05T20:12:11","slug":"pesticide-residues-in-pet-food-threaten-health-of-companion-animals-regulatory-deficiencies-cited","status":"publish","type":"post","link":"https:\/\/beyondpesticides.org\/dailynewsblog\/2025\/06\/pesticide-residues-in-pet-food-threaten-health-of-companion-animals-regulatory-deficiencies-cited\/","title":{"rendered":"Pesticide Residues in Pet Food Threaten Health of Companion Animals; Regulatory Deficiencies Cited"},"content":{"rendered":"

(Beyond Pesticides<\/em>, June 6, 2025) Published in Environmental Pollution<\/em><\/a>, a study of commercial dry pet products finds dietary pesticide residues in dog and cat food, \u201chighlighting the urgent need for improved regulatory frameworks to address the presence of non-approved pesticides in pet food.\u201d Additionally, the researchers point out: \u201cCurrent regulatory frameworks primarily assess the toxicity of individual pesticide compounds, yet real-world exposure involves complex mixtures that may lead to additive or synergistic effects<\/a>. The presence of multiple residues in a single sample suggests that companion animals may be subjected to combined toxicological burdens that are not yet fully understood.\u201d (See studies here<\/a>, here<\/a>, and here<\/a>.)<\/p>\n

The researchers assess pesticide contamination, and their associated toxicological risks, in 83 total food products for dogs (43) and cats (40). Of the foods tested, the researchers found a total of 51 pesticides, many of which are banned in the European Union (EU), including 47% fungicides and 37% insecticides.<\/p>\n

\u201cPesticide residues in pet food pose potential risks to animal health, yet their occurrence and dietary exposure in companion animals remain largely unexplored,\u201d the authors state. They continue: \u201cTo our knowledge, this is one of the first comprehensive investigations assessing both pesticide prevalence and potential dietary exposure in companion animals. Previous research has primarily focused on the presence of contaminants in livestock feed, with limited attention given to pet food safety.\u201d<\/p>\n

To address this gap, this study focuses on dog and cat food, especially given the distinct dietary patterns and metabolic processes in these animals that are significantly different from farm animals. This also aligns with the increasing demand for high-quality pet nutrition. In Spain, where the study was conducted, the researchers report that, \u201c… [the] pet population includes approximately 9.3 million dogs and 5.9 million cats. Dry food remains the dominant segment, representing 88.1% of dog food sales and 74.8% of cat food sales. This market expansion underscores the need for continuous monitoring of pet food safety and quality.\u201d<\/p>\n

Since pet food can contain many plant-based ingredients, there is a high risk of contamination from pesticides used in chemical-intensive conventional agriculture. Cereals (like corn, rice, wheat, barley, and sorghum), as well as various vegetables (such as peas, potatoes, carrots, and legumes), are often used in modern pet food formulations.<\/p>\n

As the authors note: \u201c[T]he increasing use of plant-based ingredients in pet food formulations has raised concerns about the presence of contaminants, particularly pesticide residues. Many pesticides applied during the cultivation, transportation, and storage of raw materials persist in the final pet food product.\u201d (See studies here<\/a> and here<\/a>.)<\/p>\n

They continue: \u201cAdditionally, animal-derived ingredients contribute to contamination, as pesticide residues bioaccumulate in livestock tissues<\/a> used as protein sources in pet food. This dual exposure from both plant- and animal-based ingredients underscores the need for systematic monitoring of pesticide residues across all components of pet food formulations.\u201d<\/p>\n

Study Methodology<\/em><\/p>\n

The study\u2019s aim, as the researchers share, is to conduct a comprehensive analysis of pesticide residues in commercial dog and cat food by determining the prevalence of pesticide residues in a wide range of pet food products, comparing detected levels with existing maximum residue limits (MRLs) for livestock feed, and evaluating the potential toxicological risks associated with chronic exposure in companion animals.<\/p>\n

The 83 food products were obtained from \u201cretail outlets, specialized pet stores, and supermarkets in Gran Canaria (Canary Islands, Spain), reflecting Spain’s predominant sales distribution patterns, as reported by distributors,\u201d the authors say. The products encompass a range of price points, brands (only internationally and nationally distributed brands were considered), and ingredients, with at least 40% of the samples containing vegetables in order to represent plant-based formulations.<\/p>\n

In explaining the methodology, the researchers state: \u201cTo estimate the dietary exposure to pesticide residues in companion animals, the estimated daily intake (EDI) was calculated for each pesticide detected in dry pet food samples. The EDI was determined by multiplying the concentration of each pesticide residue in a given sample by the recommended daily consumption (g\/kg body weight\/day) provided by the manufacturer for that specific product. This approach allowed us to estimate exposure levels relative to body weight basis for both dogs and cats, accounting for species-specific dietary variations.\u201d<\/p>\n

Cumulative exposure to pesticides was also evaluated by using a Hazard Index (HI) for the pesticide classes, including herbicides, fungicides, insecticides, acaricides, and post-harvest preservatives. \u201cThis classification accounts for differences in modes of action and potential toxicological interactions within each category,\u201d the authors explain. \u201cAdditionally, a total cumulative HI was calculated to provide an overview estimate of pesticide exposure in pet food.\u201d This approach, however, does not account for synergistic effects<\/a> of pesticide mixtures that can amplify adverse health outcomes.<\/p>\n

Results<\/em><\/p>\n

Of the 51 pesticides identified in at least one sample of the pet food products, 19 (37.25%) are banned in the EU. \u201cA key finding of this study was the high prevalence of unapproved pesticides in the analyzed samples,\u201d the researchers state. \u201cThese include long-banned substances such as atrazine<\/a> (herbicide), chlorpyrifos<\/a> (insecticide), and carbendazim<\/a> (fungicide), which were prohibited due to their environmental persistence and potential toxicity to non-target species.\u201d<\/p>\n

This is of great concern, as the study points out: \u201cCompounds such as chlorpyrifos, carbendazim, and atrazine have been linked to neurotoxicity, endocrine disruption, and long-term ecological damage. The continued presence of these substances in commercial pet food suggests potential contamination of raw materials, insufficient regulatory oversight, or unauthorized use in certain agricultural practices.\u201d \u00a0(See studies here<\/a>, here<\/a>, and here<\/a>.)<\/p>\n

Nineteen of the pesticides also exceed the MRL for feed materials under the EU Commission Regulations. The authors continue, reporting that, \u201cPesticide residues were significantly more prevalent in pet food containing vegetable ingredients. Although pesticide residues were detected more frequently in dog food than in cat food, total pesticide concentrations did not significantly differ between species.\u201d<\/p>\n

The estimated daily intake (EDI), however, was calculated and reveals significant differences in exposure levels for specific compounds between dogs and cats. \u201cPet foods containing vegetables, fruits, or cereals had higher total pesticide concentrations than those formulated exclusively with animal-based ingredients,\u201d the researchers note. \u201cThis finding aligns with the widespread use of pesticides in crop production and post-harvest treatments, suggesting that plant-based components in pet food are a primary source of pesticide residues.\u201d<\/p>\n

Notably, the results reveal certain pet food brands contain \u201cparticularly high contamination levels, with up to 20 pesticide residues detected in a single dog food sample and 21 in a single cat food sample, respectively.\u201d This did not, however, correlate with price point or type of brand (store brand vs. commercial). \u201cDespite the common perception that premium-priced pet foods may adhere to stricter quality standards, our results indicate that pesticide contamination is independent of product price,” the authors say.<\/p>\n

Although the Hazard Index (HI) calculations, to assess the potential risk posed by cumulative pesticide exposure, were \u201cbelow the critical threshold of 1, indicating that individual pesticide exposure levels do not pose an immediate toxicological risk, chronic exposure effects remain uncertain.\u201d (See studies here<\/a> and here<\/a>.)<\/p>\n

Regulatory Deficiencies<\/em><\/p>\n

Due to regulatory uncertainties, the cumulative risks of prolonged dietary pesticide exposure to pets need to be evaluated. As the authors stress, not only do the long-term effects of chronic low-dose exposure to pesticide mixtures have uncertain effects, but there is also an \u201cabsence of specific maximum residue limits (MRLs) for pet food [that] underscores the need for stricter regulations and systematic monitoring to ensure long-term safety.\u201d Since pet food formulations are vastly different from livestock feed, current regulatory frameworks specifically addressing contaminants in companion animal diets are necessary.<\/p>\n

The authors conclude: \u201cFrom a regulatory standpoint, our findings highlight the urgent need for stricter monitoring and enforcement of pesticide residue limits in pet food… The absence of specific guidelines for companion animal diets represents a significant regulatory gap that should be addressed to ensure the long-term safety of pets.\u201d (See additional Daily News<\/em> coverage on pet health here<\/a>.)<\/p>\n

Previous Research<\/em><\/p>\n

In the study, various scientific literature is cited that supports the results. This includes:<\/p>\n