Tracking water intake for a 30 kg dog after rhubarb exposure
Measuring how much your dog drinks over the next few days gives the clearest picture of kidney function. Fill his bowl to a marked line each morning and track how often you refill it — a healthy dog this size typically drinks 1-2 liters daily. If he laps up less than half his usual amount over 24 hours, or stops visiting the bowl entirely, call your vet immediately.
Notice whether he seems to struggle with thirst despite drinking normally. Some dogs will hover near the water bowl but barely swallow, or lick ice cubes without really quenching their thirst. These subtle changes matter just as much as the volume consumed, especially during the first week when kidney stress peaks.
Urination patterns that warrant concern
Take him outside hourly if possible to observe urine output — what looks like frequent small puddles could actually be straining without production. Dark yellow or brown-tinged urine, or urine with a strong ammonia smell, suggests the kidneys aren't filtering properly. For large dogs, aim to see at least four substantial pees per day.
Accidents in the house suddenly happening with a previously housebroken dog can indicate urgency from kidney irritation. Keep notes on timing and volume; your vet may request a urine sample if patterns seem off. Don't wait for total urine stoppage — that's a critical emergency requiring immediate intervention.
Appetite changes after oxalate exposure
A 30 kg dog should show interest in food within 12 hours post-treatment unless sedatives were used. Offer small portions of his regular diet mixed with water or low-sodium broth to encourage eating. Refusing favorite treats or taking unusually long to finish meals are early red flags owners often miss.
Watch for chewing motions without swallowing, or food falling from his mouth — oral irritation from oxalates can make eating painful. If he'll only eat soft food after three days, ask your vet about mouth rinses. Weight loss exceeding 5% of his body weight in a week means the kidneys likely need support.
Behavioral signs of ongoing kidney stress
Lethargy looks different in large breeds — a normally active dog who now lies down between rooms instead of following you, or who hesitates before jumping onto furniture. Time how long it takes him to rise from naps; added seconds can indicate systemic discomfort. Panting while at rest is another subtle cue.
Pay attention to where he chooses to sleep. Dogs with kidney pain often seek cool tile floors or shift positions constantly. Restlessness at night paired with daytime exhaustion suggests the body is struggling to balance toxins. These observations help vets decide when bloodwork should be repeated.
The full verdict, portion guidance and serving notes are collected on the Rhubarb food facts page.