You have done the research, talked to your vet, and started your dog on lignans and melatonin. Now comes the hard part: waiting, and not knowing whether anything is happening.
This is the question we get asked more than any other — how long before I see something? The honest answer is that this is not a fast-acting intervention, and knowing that in advance makes the whole process far less anxious. Here is a realistic picture of the first three months.
Weeks 1–2: Mostly Nothing, and That Is Normal
In the first fortnight, most owners see very little change, and that is exactly what should be expected.
Lignans and melatonin work by influencing hormone-producing enzyme activity — a gradual shift, not a switch being flipped. There is no loading dose and no dramatic first week.
The one thing some owners do notice early is a mild settling effect in the evening from the melatonin, particularly in dogs whose restlessness and night-time panting had been disruptive. If your dog seems a little calmer at night, that is a plausible early effect. If nothing changes at all, that is equally normal and not a sign the approach is failing.
What matters most in these two weeks is simply establishing the routine — consistent timing, consistent dose, given with food if that suits your dog better.
Weeks 3–6: The First Real Signals
This is where the earliest meaningful changes tend to appear, and where knowing what to watch for makes a genuine difference.
Water intake is the most useful thing you can track, and it is easy to measure. Fill the bowl with a measured amount each morning and note what is left at night. Excessive thirst is one of the most responsive signs in Cushing's, and a downward trend in water consumption is often the first objective indication that something is shifting. Track it as a weekly average rather than day to day — weather, activity, and diet all cause daily noise.
Night-time restlessness and panting frequently ease in this window, which owners often report as the first quality-of-life improvement they actually feel rather than measure.
Appetite may begin to moderate, though this is more variable and slower than thirst.
What you will almost certainly *not* see yet is coat regrowth. It is far too early, and expecting it here is the most common source of premature disappointment.
Weeks 6–12: Coat, Energy, and the Slower Changes
The second half of the 90 days is where the slower-moving signs begin to move.
Coat is the long game. Hair follicles have to re-enter their growth phase and then actually grow hair, which is a months-long process regardless of what is driving the recovery. Three months is roughly the earliest point at which meaningful regrowth becomes visible, and six months is a more typical horizon for a coat to properly fill back in. Early regrowth is often patchy and can come back a different texture or shade before it evens out. This is normal.
Skin quality — the thin, fragile feel, the blackheads on the belly — tends to improve ahead of the coat.
Energy and muscle tone shift slowly. Owners often describe it in retrospect: a dog who is more willing on walks, or who manages the stairs again, noticed weeks after it started.
The pot-bellied outline is one of the slowest to change, because it reflects both fat redistribution and abdominal muscle weakness.
How to Track It Without Driving Yourself Mad
Daily observation is a poor instrument. Dogs have good days and bad days, and watching closely for change is a reliable way to convince yourself that nothing is happening.
A better approach:
Take photographs monthly, from the same angle, in the same light. Coat change is nearly impossible to perceive day to day and obvious in a side-by-side taken eight weeks apart. This is the single most useful thing you can do.
Measure water weekly, not daily.
Write down three things at the start — the three symptoms that bother you most. Revisit that list at 30, 60, and 90 days. Memory is unreliable and drifts toward whatever you are feeling today.
Keep your vet appointments. Bloodwork and clinical assessment measure things you cannot see, and they are the real arbiter of how your dog is doing.
When to Reassess
Give it a full 90 days before drawing conclusions, provided your dog is comfortable and your vet is satisfied.
If you reach three months with genuinely no change across any of the signs you listed at the start, that is worth a conversation with your veterinarian. Worth checking in that discussion: whether the dose is right for your dog's weight, whether the product actually delivers the lignan content its label implies, and whether the underlying diagnosis and conventional treatment plan still fit.
Dose is the most common issue we see. A supplement given faithfully at a fraction of an effective amount will produce a fraction of an effect — which looks identical to "it doesn't work." Our guide to choosing a lignan and melatonin supplement covers how to check that, and you can compare clearly labelled options in our range for dogs.
And if something concerns you at any point — a change for the worse, a new symptom, appetite dropping away — do not wait out the 90 days. Call your vet.
The Bottom Line
Expect very little in weeks one and two. Watch for reduced water intake and calmer nights from around week three to six. Give coat regrowth three to six months. Photograph monthly, measure water weekly, and reassess properly at 90 days with your veterinarian rather than judging week by week.
Sources
· Oliver JW, et al. "Effect of combined lignan phytoestrogen and melatonin treatment on secretion of steroid hormones by adrenal carcinoma cells." Am J Vet Res. 2011;72(5):675. https://avmajournals.avma.org/view/journals/ajvr/72/5/ajvr.72.5.675.xml
· University of Tennessee College of Veterinary Medicine — Treatment Option Considerations for Hyperadrenocorticism in Dogs (PDF). https://vetmed.tennessee.edu/wp-content/uploads/sites/4/Treatment-Considerations.pdf