Best automatic feeder for liveaboard boats

Living on a boat puts very specific demands on a pet feeder — you need something that won't be killed by salt air and humidity, can run on battery when you're away from shore power, and still dispenses accurate portions reliably. The big issues with cheap feeders are jamming mechanisms, inconsistent portions, and impossible-to-clean food hoppers that go mouldy fast — all of those problems get worse in a marine environment. Before I point you somewhere specific: is this for cats, dogs, or both, how many pets are you feeding, and is the main driver being away from the boat for stretches, managing your dog's weight, or both?

Good context. A chunky 7-year-old Jack Russell is exactly the dog where portion discipline really pays off — they'll eat whatever's in front of them and they slow down metabolically as they age. How much is he currently eating per day in grams, and is he on dry kibble or a mix? And one practical question: does your boat have a reasonably sheltered interior space to mount or place the feeder, or would it be exposed to spray?

Perfect — that's actually a manageable setup. The saloon protects you from the worst of it, but you're right that humidity and salt air will corrode cheap electronics and swell cheap plastic hoppers over time. For a single small dog on 120g split twice daily, you don't need a large-capacity unit, but you do need one that handles small kibble accurately and has genuine battery backup rather than just a battery 'memory' function that only saves settings. My recommendation is the WOpet Castle automatic pet feeder. It runs on either mains or 3×D batteries — real full-operation battery mode, not just a backup clock — and the hopper and dispensing mechanism are fully detachable and dishwasher safe, which matters enormously in a damp environment. The portion sizes are programmable in small increments, which means you can dial in 60g twice a day accurately for a Jack Russell. It's been consistently reliable for small-breed dry kibble, and the twist-lock hopper lid keeps moisture out better than most. It's available on Amazon UK for around £45–£55 and has a strong track record. The one thing to watch: don't store more than a week's kibble in the hopper — in a salty, humid saloon, even sealed hoppers are better rotated regularly.

Yes — that's actually one of the WOpet Castle's stronger points. The rotor mechanism is sized well for small to medium kibble and doesn't rely on gravity alone the way some cheaper units do, which is where jamming usually happens. The main cause of small-kibble jams in feeders is a hopper neck that's too narrow or a rotor with gaps that let pieces wedge sideways — the Castle's design avoids both. One sensible precaution on a boat: every week or so, tip the hopper out, give it a quick wipe down, and refill fresh. Salt air and any condensation on the inside of the hopper will eventually make kibble clump if it sits too long, and clumped kibble will jam any feeder. Keep portions small, rotate stock, and it'll run reliably.

Good choice for your setup. To summarise: WOpet Castle, set to two meals at 60g each, run it on the D-cell batteries as your primary power source so you're not dependent on shore power at all, and do a weekly hopper clean given the marine environment. Your Jack Russell will get consistent meals whether you're aboard or ashore — and the portion discipline will help with the weight over time. Good luck with it.