Regular bloodwork is not your vet upselling you — it is the only way to catch silent organ stress before it becomes a real crisis in a dog who can’t tell you something feels wrong.
If your dog has been on long-term arthritis pain medication and your vet keeps scheduling blood tests, you’re probably juggling two feelings at once: relief that someone is keeping a close eye on things, and quiet dread about what they might be looking for. That mix is completely reasonable. Let me walk you through what’s actually happening with those tests, why they matter, and how to make sense of the results when they come back.
Why Does Long-Term Arthritis Medication Require Monitoring?
The most common arthritis medications in dogs are NSAIDs — non-steroidal anti-inflammatory drugs. They work by reducing the inflammatory chemicals that cause joint pain, which is exactly what you want. The trade-off is that this same mechanism affects blood flow to the kidneys and can influence the liver’s ability to process the drug over time.
This doesn’t mean NSAIDs are dangerous — for the right dog at the right dose, they’re genuinely life-improving. But they’re not neutral, either. The bloodwork is how your vet keeps the balance in check.
The two main concerns are:
- Kidney function: NSAIDs can reduce blood flow to the kidneys, especially in dogs who are already slightly dehydrated, older, or have mild underlying kidney disease. Over time, this can gradually affect how well the kidneys filter waste.
- Liver function: The liver processes most drugs, and some dogs develop elevated liver enzymes while on long-term NSAIDs. Elevated enzymes don’t automatically mean liver damage — they’re a signal to pay attention and often to recheck.
- BUN and creatinine — waste products filtered by the kidneys; elevated levels suggest the kidneys may be under stress
- ALT and ALP — liver enzymes that rise when liver cells are stressed or inflamed
- Phosphorus — another kidney marker, often elevated alongside creatinine in kidney disease
- CBC (complete blood count) — checks for anemia and other changes that can accompany long-term inflammation or medication use
- SDMA — a newer, more sensitive early-kidney-damage marker that many vets now include routinely
How Often Should Bloodwork Happen?
Most vets follow a schedule that looks something like this, though your dog’s individual history may mean more or less frequent testing:
| Timing | What’s Checked | Why |
|---|---|---|
| Before starting medication | Full chemistry panel + CBC | Establishes a baseline; catches pre-existing issues |
| 2–4 weeks after starting | Chemistry panel (at minimum) | Catches early reactions before they compound |
| Every 6 months (stable dogs) | Full chemistry panel + CBC | Ongoing organ monitoring for long-term use |
| More frequently if values are borderline | Chemistry panel | Tracks whether a change is stabilizing or worsening |
disableddogcare.comSome vets space it out to once a year for dogs who have been on the same medication for years with consistently normal results. Others stick to every six months regardless. Both approaches have reasonable justification — it’s worth asking your vet what their reasoning is for your specific dog, especially if the cost is adding up.
What Does It Mean If Values Come Back Abnormal?
Mildly elevated values do not automatically mean your dog needs to stop the medication. This is the part that worries owners most, and it’s worth understanding what actually happens next.
Your vet will typically look at three things: how much the value has changed from your dog’s personal baseline, whether the change is in one marker or several, and whether there are any symptoms alongside it.
A common next step for mildly elevated kidney or liver markers is a short medication pause — sometimes called a “washout period” — followed by a recheck. If values normalize off the medication, that suggests the drug was contributing. If values stay elevated, there may be an underlying condition that needs its own attention.
Options after abnormal results generally include:
- Dose reduction: Sometimes a lower dose controls pain adequately while reducing organ burden
- Switching NSAIDs: Dogs can respond differently to different drugs in the same class; a switch sometimes resolves the issue
- Moving to a non-NSAID approach: Gabapentin, joint supplements, laser therapy, or acupuncture may carry the pain management load, either alone or in combination — the gabapentin for arthritic dogs overview is worth reading if this comes up in your conversation
- More aggressive monitoring: Staying on the medication but rechecking more frequently while watching for further changes
- Increased thirst or urination (a common early sign of kidney stress)
- Decreased appetite or vomiting
- Yellowing of the skin, whites of the eyes, or gums (jaundice — a liver warning sign)
- Unusual fatigue or a sudden drop in activity level beyond what you’d expect from the arthritis
- Dark urine or pale gums
Is the Cost of Monitoring Really Worth It?
I hear this question a lot, and I want to give you an honest answer rather than just a reassuring one.
The cost of a blood panel varies quite a bit by region and clinic — from roughly $80 to $200 or more for a full chemistry panel with CBC. For a dog who needs twice-yearly monitoring indefinitely, that adds up. I understand why you’re doing the math.
Here’s the thing: the conditions these tests catch early — early kidney disease, rising liver enzymes — are far more expensive (and harder on your dog) to manage once they’ve progressed significantly. Catching a problem at “slightly elevated” rather than “significantly compromised” usually means more options and lower overall cost. As VCA Hospitals notes in their guidance on NSAID use in dogs, baseline testing before starting these medications and routine follow-up monitoring are considered standard of care precisely because early detection changes outcomes.
It’s also worth asking your vet whether the panel can be run through an outside laboratory rather than in-house — outside labs are often less expensive, with the same accuracy. Some veterinary pharmacy discount programs can also help with the medication portion of the cost; the veterinary pharmacy discount programs guide has practical detail on this even though it was written with IVDD in mind — the programs themselves apply broadly.
- Ask if your vet can run bloodwork through an outside lab rather than in-house
- Request that monitoring be bundled with an existing annual wellness visit when timing allows
- Ask about which specific markers are most important for your dog’s medication — sometimes a targeted panel costs less than a comprehensive one
- If cost is a genuine barrier, be honest with your vet; they may be able to prioritize the most critical values
What About Medications That Aren’t NSAIDs?
Not every arthritis medication carries the same monitoring burden. Gabapentin, for example, is processed differently and doesn’t require the same kidney and liver surveillance. Joint supplements like glucosamine-chondroitin don’t require organ monitoring either — though they also typically provide milder pain relief on their own.
Some dogs do well on a combination approach: a lower NSAID dose that’s more tolerable to the organs, supplemented with non-NSAID options that carry their weight on the pain side. From what I’ve seen and heard from other caregivers, this kind of layered plan is increasingly common, especially for older dogs or dogs with borderline kidney values.
If you’re managing arthritis alongside another condition, that complexity matters too. The article on managing arthritis in dogs covers the broader care picture, which is useful context when you’re making medication decisions that affect multiple body systems.
- Do not give human NSAIDs (ibuprofen, naproxen, aspirin) to a dog — they are toxic to dogs at almost any dose
- Do not stop prescription arthritis medication abruptly without talking to your vet first
- Do not skip scheduled bloodwork and assume everything is fine because your dog “seems okay”
- Do not add a second NSAID or a corticosteroid alongside an existing NSAID — combining these causes a significant risk of gastrointestinal bleeding
Related Reading
- Pain Medications for Dogs With Arthritis
- Gabapentin for Arthritic Dogs: What to Expect
- Managing Arthritis in Dogs: A Complete Care Guide
The honest truth is that nobody wants to sit in the waiting room for another blood draw and another bill. But this particular recurring cost is one of the better ones — it’s your vet staying ahead of a problem rather than reacting to one. If the results keep coming back normal, that’s genuinely good news worth paying for. And if something does shift, you want to know early, when there’s still room to adjust.
This guide is based on real experience and should be used alongside professional veterinary care. Always consult your veterinarian before starting any new treatment or making changes to your dog’s care plan.
Frequently Asked Questions
How often does my dog need bloodwork while on arthritis medication?
Most vets recommend a baseline panel before starting, a recheck at 2–4 weeks, and then every 6 months for stable dogs on long-term NSAIDs. Dogs with pre-existing kidney or liver issues may need more frequent testing. Ask your vet what schedule fits your dog specifically.
What happens if my dog’s bloodwork comes back abnormal?
Your vet will likely pause the medication, recheck the values after a short washout period, and then decide whether to restart at a lower dose, switch to a different drug, or move to a non-NSAID pain management approach. Mildly elevated values don’t always mean permanent discontinuation.
Can I skip bloodwork if my dog seems fine?
This is a common question, and I understand the cost pressure — but the problem is that organ stress from long-term medication often doesn’t cause obvious symptoms until it’s significant. The bloodwork catches the early changes you can’t see.
Are there arthritis medications that don’t require bloodwork monitoring?
Some non-NSAID options — like gabapentin or joint supplements — don’t require the same organ monitoring. However, they also provide different (often more limited) pain relief. Talk to your vet about whether a combination approach could reduce your dog’s NSAID dose and monitoring frequency.