If your pet is fine on their current food, leave it alone. We mean that. The most common reason we see a customer’s pet on the wrong diet is that someone, somewhere, recommended a "better" food and the switch went badly.
That said, switches sometimes have to happen — a life stage change, a sensitivity, a brand discontinued. When they do, how you switch matters far more than what you switch to.
The 9-day rule
The single best piece of advice we can give you is to go slow. Nine days is the sweet spot: long enough for the gut microbiome to adjust, short enough that nobody loses interest.
| Day | Old food | New food |
|---|---|---|
| 1–3 | 75% | 25% |
| 4–6 | 50% | 50% |
| 7–9 | 25% | 75% |
| 10+ | — | 100% |
Stick to mealtimes. Same bowls, same place, same timing. The only variable should be the ratio.
What to watch for
- Stool quality day-by-day. A soft stool on day two is normal. A liquid stool on day two means slow down — hold the ratio for two extra days.
- Energy. A noticeable energy dip past day three is a flag.
- Itching or paw-licking. These can lag a real protein switch by 10–14 days. If they appear, we are likely dealing with a sensitivity, not a transition issue.
If anything looks wrong, you don’t need to start over. Just stay at the previous step for two more days and resume.
Cats are not small dogs
Two species-specific notes:
- Cats are notorious about texture changes. If you are switching from kibble to wet (or vice versa), the 9-day plan extends to 14, and you can warm the new food slightly to release scent.
- Dogs handle protein changes better. Even so, going from chicken to a novel protein like salmon or rabbit deserves the full 9 days — the gut needs to grow enzymes for the new substrate.
What we do at SmartPaw
When a customer asks us to swap a brand mid-plan, we don’t just change the next box. We ship a transition pack for the first cycle — the new bag plus a small bag of the old brand — so the family can run the 9-day plan without buying two bags at full price.
Common mistakes
- Going cold-turkey. "He looks fine, so I just dumped the new bag in." We see this once a fortnight, and it ends in a Saturday morning carpet incident.
- Mixing inside the same bowl over weeks. This trains the pet to graze, not to eat. Pre-portion the day’s meals at the start of the day; mix in the bowl, not the bag.
- Combining a switch with another change. A new home, a new feeder, a new puppy — none of these mix well with a diet change. Pick one variable at a time.
When to call a vet, not a brand
If after a full 9-day cycle and another week on 100% new food your pet has:
- Persistent diarrhoea
- Visible weight change
- New itching or skin issues
- Behavioural change
...stop and book a vet check. The new food might not be the problem at all, and a switch can mask the symptoms of something that needs a real look.
TL;DR
Slow is fast. Nine days, four ratios, eyes on the stool, mealtimes locked. That is the whole technique. Brands matter less than people sell you, and the ones that matter come back to one question: is your pet thriving on what they eat right now?
If you want a transition pack the next time you change brands, tell us your routine and we’ll add it to your plan at no extra cost.
