Why is it risky?
EPS foam has low chemical toxicity when intact but crumbles into small beads and fragments that cats frequently ingest during play, the crunching sound and texture attract investigation. Ingested EPS cannot be digested and may cause partial GI obstruction. Some EPS formulations contain flame retardants (HBCD) with documented endocrine-disrupting properties in animal studies, raising additional concern with chronic contact.
Affected Systems
Digestive
Symptoms
Vomiting, retching, anorexia. Large amounts ingested: obstruction symptoms.
What To Do
Keep cats out of rooms where EPS packaging is being opened. Contact vet if a large amount was consumed.
Notes
Discard EPS packaging immediately, once fragmented, it is impossible to fully account for all pieces. Alternative packaging materials: paper pads, compostable starch peanuts (which dissolve in water and are non-toxic). Starch-based packing peanuts can be distinguished from EPS by dissolving when wet.
Sources
→ ASPCA Animal Poison Control Center — aspca.org
→ VCA Animal Hospitals — vcahospitals.com