Sometimes the first sign of arthritis isn't what your pet stops doing. It's what they figure out how to keep doing differently.
A dog may still climb the stairs, but pause halfway up. A cat may still sleep on the bed, but start using a chair as a halfway point instead of jumping straight from the floor. A horse may still move willingly under saddle, but take longer to loosen up at the beginning of a ride.
None of those changes automatically means arthritis. But when you know an animal well, small changes in how they go about ordinary things can tell you that something isn't quite the same.
Everyday Activities Start to Look Different
We're more likely to notice something is wrong when an animal stops doing something altogether. The changes that happen before that can be much easier to miss.
Maybe your dog still gets up to greet you, but getting off the floor takes a little more effort. They still want to go for a walk, but they're no longer charging out the door.
Your cat still gets to a favorite spot, but the route has changed. Instead of one effortless jump, there are now two smaller ones.
Your horse still trots when asked, but those first few minutes feel stiffer than they used to.
When changes happen gradually, there may never be a single moment when you think, Something is wrong. The new way of doing things simply becomes normal.
They Start Choosing the Easier Option
Animals are pretty good at finding another way to do something that's become uncomfortable.
A dog may start waiting to be helped into the car. A cat chooses a lower sleeping spot. A horse takes a wider turn or seems less willing to move in a way that was once easy.
You may also notice changes that don't immediately look like mobility problems. An animal might spend more time resting, become less interested in certain activities, or seem hesitant on slick floors or other difficult surfaces.
These aren't proof of arthritis. Injuries and other health problems can cause similar changes. What matters is noticing when an animal repeatedly starts choosing the easier option.
Sometimes We Change Our Habits, Too
This may be one of the easiest clues to overlook because we adjust right along with our animals.
At some point you started lifting the dog into the SUV.
You moved something closer because the cat wasn't going upstairs as often.
You've begun giving the horse a little more time to warm up before asking for much.
Maybe you put a rug over a slippery floor, moved a pet bed, added a step or simply stopped expecting an animal to do something they once did routinely.
Those little accommodations are part of living with animals, particularly as they get older. But every once in a while, it's worth asking yourself why you started making them.
Pay Attention to the Pattern
One awkward jump or slow morning isn't enough to tell you that an animal has arthritis. What becomes more useful is a pattern.
Has the change been happening more often? Is getting up consistently harder after a long nap? Does your cat repeatedly avoid a particular jump? Is your horse regularly stiff at the beginning of work?
If something happens intermittently, taking a short video can be useful. The behavior you see at home or in the barn may not happen during a veterinary appointment.
And don't assume a change is arthritis simply because an animal is getting older. If you'd like to understand why osteoarthritis-related pain can be so difficult to recognize, read Your Pet Might Have Hidden Osteoarthritis-Related Pain.
What to Tell Your Veterinarian
You don't need to figure out which joint hurts or arrive with a diagnosis. Tell your veterinarian what has changed.
When did you first notice it? What does your pet do differently now? Is it worse after resting or after activity? Are there things they hesitate to do that they once did easily?
Those everyday observations can be useful because you know what's normal for the animal in front of you.
A sudden or severe change is different. An animal who suddenly can't bear weight on a leg, can't stand, appears to be in significant pain, or has obvious swelling or heat around a joint needs veterinary attention rather than an assumption that it's ordinary arthritis.
For the slower changes, the important thing is simply to notice them.
Sometimes the sign isn't that your pet can't do something anymore. It's that they've quietly found a different way to do it.
Last updated: October 2, 2026
Originally published: November 7, 2007