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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.
Pets are subject to latent toxicological hazard from microplastics (MPs) contamination in dry pet food (DPF). Very little is understood about the commercial and regional variables leading to the MP exposure by DPF intake. The goal of this study was to compare MP contamination in dog and cat DPF commercially available in Spain and Ecuador. The analysis relied on stereomicroscopy, scanning electron microscopy, and μFTIR spectrophotometry, which indicated a significant difference in MP abundance and composition. Ecuadorian items, especially those sold in bulk (loose), achieved concentrations of 12.33 ± 1.53 MPs/5 g, whereas Spanish samples maintained lower baselines (3.33-11.33 MPs/5 g). In unsealed Ecuadorian samples, Fourier transform infrared spectroscopy (μFTIR) revealed a broad polymeric profile that included polyethylene terephthalate (PET), polyethylene (PE), and polypropylene (PP) in combination with industrial indicators such as polytetrafluoroethylene (PTFE) and polydimethylsiloxane (PDMS) and the dangerous plasticiser benzyl butyl phthalate (BBP). According to morphological analysis, fibres represented 70-80% of the particles, and as many as 44% of them were classified in the potential translocatable 1-20 μm range. According to daily intake estimates, dogs in Ecuador had the greatest cumulative MP burden, consuming roughly 461 MPs/day as compared to 395 MPs/day in Spain. These results suggested that bulk commercialisation was a significant secondary vector for hazardous exposure, whereas industrial processing and raw materials (marine and agricultural) were the main contaminant sources. In conclusion, enhanced regulatory control of storage and packing processes shall be crucial to reduce chronic MP intake and potential endocrine disruption in pets.
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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.
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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
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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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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.