Why a 5 kg dog can handle crust better than toppings
The bread base is the least concerning part for a small dog—it's dense but mostly carbohydrates. Your pup's weight means they'd need to eat far more crust to risk a dangerous stomach expansion compared to a toy breed. The real issue is what clung to it: grease, cheese, or seasoning remnants that could irritate their gut. Since you didn't mention toppings, focus on simple carb overload signs like bloating or gassiness.
Two hours in, any immediate reaction would likely have shown by now. Rich fats take longer to cause trouble because they slowly trigger pancreatic enzymes. Small breeds often hide discomfort well, so watch for subtle shifts like refusing their next meal or licking their lips excessively—both early nausea hints before vomiting starts.
The 6-hour window when most problems appear
Between now and the next four hours is when 90% of pizza-related issues surface in dogs this size. Their metabolism processes rich foods faster than ours but lacks efficient bile management for sudden fat loads. If they're still playful and drinking water normally by hour six, the worst is probably over.
Diarrhea might still develop up to 12 hours later as the gut flushes out irritants. Monitor stool consistency: yellow or greasy-looking poop signals fat digestion struggles. A single loose stool isn't an emergency, but three watery ones in a row warrant vet input to prevent dehydration in such a lightweight body.
When to upgrade from watching to calling
Lethargy looks different in small dogs—don't expect collapse. If they nap longer than usual after meals or take more effort to rouse for a walk, their body is diverting energy to gut repair. Pair this with a firm or tender belly when gently palpated, and it's time for professional advice.
Pain signs are often missed in little dogs who instinctually hide weakness. Watch for the 'prayer position' (front legs down, rear up) or sudden reluctance to jump onto furniture they usually scale easily. These suggest abdominal discomfort exceeding simple indigestion.
Preventing next time's pizza theft
At 5 kg, your dog's stomach is about the size of a lime—that slice's crust was likely 1/3 their capacity. Train family to recognize that 'just one bite' for us is a meal's worth for them. Keep pizza boxes latched inside the oven until trash day; small dogs are notorious for scavenging cooled grease scraps.
If this happens often, ask your vet about keeping a dog-safe probiotic paste on hand. For tiny breeds, even mild stomach upset can spiral into dehydration faster than in larger dogs. A vet-approved gut protector can help buffer occasional dietary mischief.
The full verdict, portion guidance and serving notes are collected on the Pizza food facts page.