This is the condition where the pre-existing clause does its work backwards. Arthritis usually arrives after something else, a dysplastic hip or elbow, a torn cruciate, years of extra weight, and each of those leaves its own note. An insurer reads the whole file, so the question is not when arthritis was named but when the joint was first mentioned. It is also the class insurers price most carefully. Two of the four policies in this register put orthopedic conditions on a longer clock than ordinary illness, and one of those clocks runs six months.
What is arthritis in the leg joints, in plain terms?
Osteoarthritis is what a joint becomes once its cartilage has worn down and the bone, the capsule and the tissue around it have changed with it. Appendicular means the count covers the limb joints, shoulder to hock, and not the spine. In the UK primary-care study behind this row, 4,196 confirmed cases were found among 455,557 dogs, an estimated annual period prevalence of 2.5 per cent, which the authors put at around 200,000 affected dogs a year in the UK. Their duration work suggests it occupies 11.4 per cent of an affected dog's lifespan.
At what age does it usually appear?
Late, and slowly. The same study lists being older than eight years among the risk factors for a diagnosis, alongside breed, higher bodyweight, being neutered and being insured. That last one is a warning about the data rather than about dogs: an insured dog is more likely to be investigated and so more likely to be diagnosed. The first line in a record is rarely the word osteoarthritis. It is stiffness after rest, a shorter walk, a reluctance on stairs, and it is that earlier line rather than the diagnosis that a pre-existing clause will find.
Which clause should you check before you buy?
Three lines in the document. First the orthopedic waiting period and whether it differs from the illness one: across this register it runs from fourteen days to six months, and the six-month version can be waived only by an orthopedic examination and a form filed within thirty days of the start date. Second, how the policy defines an orthopedic condition. Both definitions we have read are open, describing the musculoskeletal system and then giving examples, so a joint disease falls inside even where it is not named. Third, the pre-existing clause, read with the earlier joint note in mind rather than the arthritis.
Do insurers treat both sides of the body as one condition?
Not named in the bilateral list at Trupanion Definitions 7.c of form TRU-00001 (08/11), page 6 of 9, though that list opens with including but not limited to and is therefore not closed. Two of the joint diseases that lead to arthritis, hip dysplasia and elbow dysplasia, are named there in their own right. The VetCompass study behind the breed figures on this page did not extract laterality, so this register has no source for calling the condition two-sided and does not score it as one; read 2026-09-04
Appendicular osteoarthritis: how long before an insurer will pay for it?
Also called arthritis in the leg joints. Each insurer's waiting period and second-side rule below, from its own policy document.
Which insurer covers arthritis in the leg joints soonest, and which makes you wait?
Appendicular osteoarthritis falls under the orthopedic class at most US insurers. The table below gives each insurer's waiting period and its rule for the second side of the body, taken from the insurer's own policy document.
| Insurer | Waiting period | Second side of the body | Hereditary and congenital | Where it says so |
|---|---|---|---|---|
| Spot | 14 days | Does not reach this condition This policy does name a second-side rule, but by naming specific conditions rather than a whole class, and this condition is not among them. | Covered | Definitions, Ligament and Knee Conditions, page 2, which names ligament, patella, meniscus and soft tissue disorders of the knee and calls them bilateral and related regardless of cause; Definitions, Bilateral Condition, page 2; Exclusions c and o |
| Lemonade | 30 days | Does not reach this condition This policy does name a second-side rule, but for conditions that occur on both sides of the body. This one does not, so the rule does not apply to it. | Covered | Waiting periods; Definitions, Orthopedic Conditions, page 14, which names elbow dysplasia, hip dysplasia, intervertebral disc degeneration, patellar luxation and ruptured cranial cruciate ligaments; Definitions, Bilateral Condition, page 14: "a chronic condition that affects both sides of your pet's body, even if clinical signs or symptoms do not present at the same time"; Pre-existing conditions, which excludes bilateral conditions whose signs were present before the start date or before the end of a waiting period |
| Trupanion | 30 days | Does not reach this condition This policy does name a second-side rule, but for conditions that occur on both sides of the body. This one does not, so the rule does not apply to it. | Not stated in the document | Waiting period at 5.b(2), page 3 of 9; bilateral exclusion at 5.c(2), page 3 of 9, which names luxating patella by example; definition of a bilateral condition at 7.c, page 6 of 9, which names elbow dysplasia including fragmented coronoid process, ununited anconeal process and osteochondritis dissecans, cruciate issues, luxating patella, hip dysplasia, cherry eye, entropion/ectropion, panosteitis and cataracts |
| Figo | 180 days | Does not reach this condition This policy does name a second-side rule, but by naming specific conditions rather than a whole class, and this condition is not among them. | Covered | Definitions 44, Waiting Period, page 3 of 13, which sets the orthopedic waiting period for dogs at six months; Definitions 26, Orthopedic Condition, page 2 of 13, which defines the class by the musculoskeletal system and adds that for the purposes of this policy it includes IVDD, any condition affecting the intervertebral spaces and osteosarcoma; General Conditions 6, page 4 of 13, on the Orthopedic Waiver Form |
The waiting period for arthritis in the leg joints is the number that decides whether a claim in the first year is paid at all, and it is the figure insurers vary most quietly. Each row below states the section of the policy it came from.
Every row cites the policy form code and the section it was read from, with the date we read it. Oldest check date on this page: .