Why bottle-cap adhesive differs from household glue
The sealant inside supplement lids isn't like standard craft glue. Manufacturers use industrial-strength polyurethane adhesives designed to bond permanently with plastic. When your cat chewed through the cap, she likely ingested a concentrated form that's far more reactive than the diluted glues pets occasionally lick off surfaces. The moment stomach fluids touch it, chemical expansion begins—sometimes doubling or tripling in volume within 30 minutes.
Unlike wood glue or school paste, this type doesn't just harden—it foams aggressively, filling space unpredictably. A pea-sized dab from the cap's rim can swell to golf-ball dimensions, pressing against the stomach walls. That's why we can't wait to see if symptoms develop; by the time she vomits or stops eating, the blockage may already be life-threatening. Even if she seems fine now, the clock started when she bit into it.
What the vet will do for a 6 kg cat
At the clinic, they'll likely start with imaging—either ultrasound or X-rays with contrast dye—to locate any expanding mass before it moves into the intestines. For a cat her size, even a marble-sized obstruction can cause serious complications. The vet may administer fluids intravenously to help prevent dehydration from vomiting and to support circulation while preparing for possible endoscopy or surgery.
If caught early, they might attempt to remove the glue via endoscope before it fully hardens. But once expansion begins, surgical intervention becomes more likely. Your cat's weight works in her favor here—larger body mass means slightly more time before metabolic distress sets in—but don't rely on that buffer. Every minute counts with reactive adhesives.
The critical first six hours post-ingestion
This adhesive's expansion timeline makes it unlike most toxins. While some poisons take hours to absorb, polyurethane glue starts transforming immediately upon contact with moisture. Within the first hour, it may still be soft enough for endoscopic retrieval. By hours 2–4, the foaming action peaks, potentially stretching the stomach wall and compromising blood flow to surrounding tissues.
Watch for subtle signs like excessive lip-licking or restless pacing—these often precede obvious symptoms. But remember: absence of symptoms doesn't mean safety. The glue could be expanding silently. Don't be fooled if she seems interested in food; some cats keep eating around blockages until the situation becomes critical.
Why joint supplement bottles pose extra risks
The supplement itself adds complications. Many joint formulas contain chondroitin or glucosamine, which are sticky substances that may interact unpredictably with the adhesive. Some also include flavorings that encourage pets to chew the container further. The plastic cap your cat destroyed was likely thinner and more brittle than household glue containers, meaning she ingested sharper fragments along with the adhesive.
Even if the supplement is pet-safe alone, the combination with glue debris creates a dangerous slurry. Sharp plastic edges can lacerate the esophagus or stomach lining, while the expanding glue traps those fragments in place. This is why we don't recommend waiting to see if she 'passes it naturally'—the physics of expanding foam adhesives make spontaneous resolution extremely unlikely.
The step-by-step response, from the first minute to the vet visit, is in our Glue & Adhesives (Including Expanding Glue) emergency guide.