Automatic feeder for giant breed puppy

For a giant breed puppy like a Bullmastiff, portion accuracy isn't just a convenience — it's genuinely important for healthy development. Overfeeding in the first year can accelerate bone growth faster than joints can handle, which leads to problems that are very hard to reverse. The most important features in any automatic feeder are portion accuracy, ease of cleaning, and mechanical reliability — cheap feeders jam, dispense irregular portions, and are often impossible to clean properly, which creates hygiene problems on top of everything else. Can you tell me a bit more: how many meals a day is your pup currently on, roughly what portion size per meal, and are you feeding kibble or anything mixed?

That portion size is on the larger end for a feeder, which matters — a lot of feeders are only tested reliably with smaller portions and can under- or over-dispense when you're pushing 150–200g at once. What size kibble is he on? Large breed puppy kibble varies quite a bit in pellet size, and some feeders struggle with anything bigger than standard kibble. That affects which unit I'd point you toward.

That's exactly the right information — Royal Canin's giant breed junior kibble is noticeably bigger than standard pellets, and some feeders will either jam on it or chew it up as it dispenses, which throws off the portion weight. You need a feeder with a wide dispensing rotor and a decent hopper opening. Given you need accuracy at larger portion sizes with big kibble, I'd go with the PETLIBRO Granary Automatic Pet Feeder — the 6-litre version. It has a slow-feed twist rotor that handles large kibble without grinding it, portion sizes are set by rotation count rather than weight, and it's been consistent enough for people using it with large and giant breed dogs. It's also one of the easier feeders to disassemble and clean properly, which matters when you're running it daily. The app and manual programming both work well. One honest caveat: because it dispenses by volume rather than weight, I'd recommend doing a test run and weighing a few portions before you rely on it — dial it in for your specific kibble size and it'll be reliable. Available on Amazon UK, around £55–65 depending on the day.

A few things worth keeping an eye on. First, re-weigh a portion every couple of weeks for the first month — kibble density can vary slightly batch to batch, even within the same brand. Second, keep the feeder away from anywhere he can nudge or paw at it; Bullmastiffs are strong even as puppies, and a feeder that gets knocked around will dispense inconsistently. Third, clean the rotor and chute at least once a week — fat from kibble coats the mechanism over time and affects how freely it turns. And check with your vet at each weigh-in whether the portion size is still right — giant breed puppies have narrow windows where the right amount of food really does matter.

Good plan — the calibration step is what makes the difference between a feeder that works and one that gives you a false sense of confidence. Weigh ten consecutive portions and average them; if you're within five grams of your target you're in good shape. Good luck with him — Bullmastiffs are a lot of dog from a very early age.