How to Start Fish Oil for an Older Dog, Step by Step

Hank is eleven now, a yellow Lab who used to beat me to the back door and now stands at the top of the three brick steps working out whether he feels like coming down. That is how it started in our house. Not with a diagnosis on a piece of paper, just a dog who got slower and a retired schoolteacher with reading glasses and too many open tabs on the laptop.

If your dog is where Hank was two winters ago, you have probably already stood in a store aisle reading the back of a bottle. You have noticed that every fish oil on the shelf claims to be the good one, that the dosing chart is either missing or printed in a font meant for younger eyes than mine, and that half the reviews sound like the same person wrote them. This is the short version of what I would tell a friend standing in my driveway. We use Nordic Naturals Omega-3 Pet softgels, the 180 count bottle, after I asked our vet whether fish oil was fine alongside the glucosamine Hank already takes. She said it was. What follows is how we started, in order, including the parts I would not skip if I had it to do over.

Step 1: Call your vet before you buy anything

The first thing I did, and the first thing I would tell you to do, is pick up the phone. Not because fish oil is a dangerous thing, but because your dog is not Hank, and I am not a veterinarian. I taught fourth grade for thirty-one years. I can tell you what a comma splice is, and I can tell you that a softgel hides in a bite of cheese better than a tablet does. I cannot tell you what is right for a dog who is on other medication, and neither can a review on the internet.

When I called, the woman at the front desk put me on the call-back list, and while I waited I wrote three questions on the back of a grocery receipt. Is fish oil fine with the glucosamine he already takes. Is there any reason not to give it to a dog his age. And how much does the label chart call for at seventy-eight pounds. That third question saved me an argument with myself, because I had already picked an amount out of the air, and I had picked wrong.

The vet said fish oil was fine alongside his glucosamine and told me to follow the chart on the label for his weight. She also said the thing I have repeated to every neighbor who has asked me about this since. If your dog is on any other medication, tell your vet what you are adding before you add it. That is the whole step. One phone call, three questions, and a note on the back of a receipt.

Step 2: Read the label the way you used to grade a paper

Here is where thirty-one years of grading comes out. I read the back of that bottle the way I used to read a stack of book reports, and I want you to do the same, because the front of a bottle is marketing and the back is the part that has to hold up.

The two things I look for are EPA and DHA, named as themselves, not folded into a vague line about omega-3s. Those are the active ingredients on the Nordic Naturals label, spelled out. The label also tells you the form is a soft gel, that the flavor is unflavored, and that the oil is made without artificial colors, flavors, or preservatives and without gluten or dairy. Nordic Naturals also puts its fish oil in the triglyceride molecular form, which the listing says is the form naturally found in fish. I am not a chemist and I will not pretend the phrase means much to me. What I can tell you is that it is printed there, plainly, and a company willing to print the details is easier for me to trust than one that shows me a picture of a salmon and calls it a day. Unflavored matters more than I expected, too. A dog who decides his dinner smells wrong is a dog who skips dinner, and unflavored means his bowl smells like his bowl.

The other number that matters is the serving size on the chart, which is keyed to weight. Hank is about seventy-eight pounds, so I read the row for his weight and I use it, and I do not round up because he is a big fellow and I want him to have a little extra. More is not better. The chart is the chart. I wrote the amount on the first page of the spiral notebook so I would stop doing arithmetic in my head at six in the morning.

Step 3: Change one thing at a time

Hank had been on his glucosamine chew since January of 2025. I added the fish oil in March, and for a good while I did not add anything else, and that was on purpose. If you change two things in the same week and your dog seems better, you have learned nothing at all. You do not know which one did it, and you may be paying every month for one he does not need.

This is also why Daisy is not on the fish oil. Daisy is our beagle mix, eight years old and twenty-six pounds of opinions, and she takes a soft chew for her joints because she will not swallow a pill or a tablet to save her life. The one time I offered her a softgel she ate the cheese, left the softgel sitting on the floor, and looked at me as though I had wasted both our mornings. So she stays with her chew and Hank gets the fish oil. Two dogs, two arrangements, and neither one of them is a competition.

The same rule works in reverse if you are starting from nothing. Start the fish oil, hold everything else steady, and give it a fair stretch before you decide anything about it. If your dog is already on three things and you cannot remember what started when, that is not a supplement problem, that is a notebook problem, and it is the easiest one on this list to fix.

Step 4: Pick a delivery method and then stop fiddling with it

A softgel goes down two ways in our house. Hank will take one in a bite of cheese and swallow it whole, which is his preference and mine. When he is being particular, Walt pokes the softgel with a thumbnail and squeezes the oil over Hank's dinner, and the empty shell goes in the trash. Both work. What does not work is setting a whole softgel on top of dry kibble and hoping, because it rolls, and an eleven year old dog is not chasing a rolling softgel across a kitchen floor.

Pick one method, use it at the same meal every day, and stop experimenting. I say that because I spent about two weeks fiddling. Cheese, then squeeze, then back to cheese. All that fiddling did was make Hank suspicious of me at breakfast, which is a sad thing to have happen with a Labrador. Dogs like a routine more than they like variety, and so do I.

One practical note about the bottle. The listing gives the dimensions and the weight, about eleven ounces and six by five by four inches, so I knew what was arriving before it arrived. It lives on the pantry shelf next to the glucosamine, because if I put it somewhere clever I will forget it, and a supplement you forget is a supplement you did not buy. If you are squeezing oil out of a softgel, do it over the bowl and not over the counter. That oil does not wipe up the way you would hope.

Step 5: Keep a log and give it months, not days

There is a spiral notebook taped inside one of my kitchen cabinet doors. It started life as a grocery pad and it became the log for both dogs. Every supplement in this house gets a line. What it is, the date we started, the amount the label chart gives for that dog's weight, and whether he ate it that day. It takes ten seconds, and it has settled more discussions with Walt than I care to admit in print.

What I write down is boring on purpose. Did he eat it. Was his stomach normal that week. Did he seem any different on the back steps. I do not write down a grade or a score, and I do not write that anything is working, because I am not qualified to say that and neither is a notebook. What the notebook does is let me look back over four months at once instead of trying to remember how last Tuesday compared to last August.

And give it months. That is the part I most want to press on you. A dog who is eleven does not change on a dime, and the honest answer to how long is that I do not know, because I am not measuring a machine and I am not running a test. What I noticed with Hank over months of his glucosamine and the fish oil is modest. He seems a little more willing on the three brick steps on a cold morning, and he gets up from a nap a little easier than he used to. He is also eleven, he has lost a few pounds because the vet told us to lean him out, and Walt walks him every single evening. I am not handing any one of those the credit, and I would not believe a person who did.

What I noticed with Hank over months is modest: a little more willing on the three brick steps on a cold morning, a little easier getting up from a nap.

What Else Helps

The fish oil is not the whole story, and I would be lying if I let you think it was. The biggest change in this house was the one the vet pushed hardest, which was getting Hank leaner. A Labrador at seventy-eight pounds with stiff hips carries every extra pound up those brick steps four times a day. We cut back the treats, we stopped the scraps from the table, and we weigh him at the vet's office instead of guessing on the bathroom scale with him in my arms.

The second thing was the walk. Walt takes him every evening, the same route at the same time, and lets Hank set the pace. Some evenings that is a slow loop out to the pecan tree and back. It is still a walk. Movement matters for an older dog and it does not have to be impressive to count for something.

The third thing is the floors. We have tile and laminate in this house, and a dog with sore hips on a slick floor looks like a deer on ice. A rubber mat at the bottom of the back steps, a rug where the hallway turns, and a little patience while he gets his feet under him did more than I expected. None of that is a supplement. All of it is part of the same job.

The fourth thing is the phone call I already made you make. Ask your vet before you add any of this, especially if your dog is on other medication. I am a retired schoolteacher with a notebook and a decent memory for labels. I can tell you what we did in our house and what the label says, and that is the honest limit of what I know.