Why the pasta sauce outweighs the greens
At 10 kg, your beagle ingested two separate concerns: the harmless arugula and the risky garlic. Even if he picked around the visible garlic chunks, oils and juices from the cooking process likely coated the greens. The arugula itself isn't the issue—it's what it carried into his system.
Garlic's toxic effects depend on preparation. Raw cloves are most dangerous, but sautéed garlic retains enough allicin to potentially damage red blood cells over 24-72 hours. Your dog's size protects him somewhat, but no weight is fully 'safe' with alliums. Watch closely even if he seems fine initially.
The critical first 48-hour window
Early signs like panting or drooling may appear within 6 hours, but the real danger period starts at the 18-hour mark. Hemolytic anemia develops gradually—you might notice tiredness first, then pale or yellowish gums. Check his gums against a white paper; they should be bubblegum pink, not whitish or mustard-colored.
Don't wait for severe symptoms. If he ate more than a tablespoon of sauce (garlic quantity is hard to judge once cooked), a vet visit now beats an emergency later. They might run a packed cell volume test to establish a baseline for comparison if symptoms emerge.
How arugula complicates monitoring
Some dogs vomit from greens alone due to the fiber, which could mask early garlic toxicity signs. If he throws up, save a sample—vet can check for garlic particles versus plant matter. Likewise, loose stools might reflect either the oil in the pasta or the garlic's irritant effects.
The arugula's bitterness may have limited how much sauce he consumed—dogs often avoid heavily garlicky bites. But assume the worst-case scenario unless you saw him eat and can estimate sauce volume precisely. When in doubt, professional assessment trumps home observation.
Longer-term considerations after exposure
Even if he shows no immediate reaction, garlic can cause delayed oxidative damage to red blood cells. For the next week, watch for decreased stamina on walks or rapid breathing at rest—subtle signs of oxygen transport issues. These warrant immediate blood work.
Going forward, rinse any greens meant for your dog under running water if they've touched alliums. The good news? Plain arugula remains a safe occasional treat once you're past this scare. Just keep it far from your cutting board next time you cook with garlic.
The full verdict, portion guidance and serving notes are collected on the Arugula food facts page.