How 30 kg versus 3 kg bodies process fruit differently
Your golden's four plum chunks are spread through a much larger digestive system, diluting any minor irritants. The same amount would overwhelm your chihuahua's tiny stomach, potentially causing blood sugar spikes or diarrhea even without toxicity.
Check if the golden ate them rapidly - big dogs sometimes swallow fruit pieces whole, increasing choking risks despite the removed pits. The chihuahua's brief sniffing suggests minimal exposure unless you find bite marks on the plum.
Why you should still monitor both dogs
While the golden likely handled the fruit fine, some dogs develop individual sensitivities to new foods. Watch for gassiness or slightly looser stools tomorrow - common but not dangerous reactions to unfamiliar fiber sources.
The chihuahua needs observation not because of what he ate (likely nothing), but because his small size makes him vulnerable to any pit fragments you might have missed during cleanup. A piece the size of a sesame seed could lodge in his narrow intestines.
Room-by-room inspection for hidden hazards
Move furniture and check under rugs - plum pits can shatter into sharp fragments when chewed by larger dogs. These become dangerous projectiles for small dogs who explore with their mouths.
Pay special attention to your golden's favorite chewing spots. Big dogs often hide food remnants in bedding or corners where tiny pets later find them. The real risk period is the next 48 hours as hidden pieces may surface.
Contrasting symptoms in different-sized dogs
Your golden might show mild stomach gurgling or increased thirst from the fruit's natural sugars. The chihuahua, if he ingested even a tiny amount, could develop shaking, restlessness, or vomiting from the same dose due to his size.
Remember that anxiety can mimic poisoning symptoms in small dogs. If the chihuahua seems "off" but you're certain he ate nothing, consider whether the commotion of the golden eating excited him rather than assuming plum toxicity.
The full verdict, portion guidance and serving notes are collected on the Plums (pitted) food facts page.