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A plastic diet for pets: Exploratory evidence of microplastics in commercial dry pet food in Spain
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Researchers detected microplastics in all five commercial dry pet food brands tested in Spain, with dog food containing more than twice the particle count of cat food, and developed a risk index model suggesting dogs face greater systemic exposure risk while cats may be more prone to chronic intestinal inflammation from fiber-type particles — positioning pets as sentinels for household microplastic exposure.
Microplastics (MPs) are increasingly recognized as emerging xenobiotics that may adversely affect animal health. Their presence in dry pet food (DPF) is poorly understood. This study provides the first exploratory evidence of MP contamination in commercially available DPF in Spain. Using μ-FTIR, stereomicroscopy, and SEM, MPs were detected in all analyzed samples (n = 5 brands). Comparing dog food to cat food, the former had over twice as many MPs (9.33 ± 0.41 MPs/5g vs. 4.07 ± 0.68 MPs/5 g; p < 0.0001). polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyamide (PA), Ethylene-vinyl acetate (EVA), and polystyrene (PS) were the polymers identified, and the main sources of contamination were environmental, processing, and packaging factors. A risk index model that considered species sensitivity, the nanometric fraction, and projected daily consumption showed that dogs are more vulnerable to systemic effects from MPs, whereas cats may have chronic intestinal inflammation because of the fibres' preponderance. Additionally, this study highlights the relevance of MPs to overall health, considering pets as potential indicators of environmental exposure. This study aimed to analyze the presence and characteristics of MPs, as well as their potential health risks in DPF marketed in Spain.
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Occurrence and characterization of microplastics in dry pet food: Investigating geographical variations between European and South American markets
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Dry pet food in Spain and Ecuador contains tiny plastic particles (microplastics), with loose, unpackaged food in Ecuador showing the highest contamination—likely picked up during bulk storage and handling. Dogs eating these foods may be swallowing hundreds of plastic particles daily, some small enough to potentially pass into body tissues, along with a hormone-disrupting chemical called BBP. While this study focused on pets, it's a reminder that packaging and food handling practices matter for microplastic exposure in general, a growing concern for human health too.
Polyethylene Terephthalate and Polycarbonate Microplastics in Pet Food and Feces from the United States
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Researchers measured PET and polycarbonate microplastics in pet food and pet feces from the United States. They found that microplastic concentrations in cat and dog feces were one to two orders of magnitude higher than in their food, suggesting that diet is only a minor source of pet microplastic exposure. The findings indicate that pets, like humans, are exposed to microplastics through multiple pathways in their shared living environments.
Microplastic prevalence in commercially available petfoods
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Researchers tested 38 popular UK pet foods and found tiny plastic bits (microplastics) in most of them—76% of products had at least some contamination, with cheaper "value" brands testing worse than premium ones. A large dog eating wet food could swallow over 300 plastic particles a day, meaning our pets may be ingesting even more microplastic than we do, and their waste could be spreading this plastic pollution into soil and wildlife. While the direct health effects on pets aren't fully known yet, this is a good reminder that microplastic exposure is showing up in more places than we realized—including the food bowls of the animals we care
Microplastics in Terrestrial Domestic Animals and Human Health: Implications for Food Security and Food Safety and Their Role as Sentinels
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This review examines how farm animals and pets are exposed to microplastics, and what that means for human health. Livestock can accumulate microplastics in their tissues during their lifetime and from processing equipment, meaning meat and dairy products may contain plastic particles. Pets like cats and dogs, who share our living spaces, could serve as early warning indicators for the levels of microplastic exposure that humans face at home.
Assessment of the Content of Plastic Inclusions in PET Food
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Researchers assessed microplastic contamination in commercial wet pet foods sold in pouch packaging from well-known brands, comparing them to a laboratory-prepared sample made without contact with polymeric materials. The study found microplastics in all commercial samples regardless of price point, while the laboratory control contained 2.3-4.4 times fewer microplastic particles, implicating packaging and processing as contamination sources.
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