Pet Food Palletizer: How Pet Food Plants Automate Heavy Case Stacking

A pet food plant does not palletize light, uniform cartons. At the end of the line are sealed cases of kibble, canned food and treats — cases that are often dense for their size, that can shift inside the box if the bags inside settle, and that arrive in many sizes for different animals, life stages and retail formats. Hand-stacking those cases, pallet after pallet, is heavy, repetitive work, and the pattern drifts as the shift goes on. Here is what to check before you automate it.

Check 1: Size to the heaviest case, not the average case

Start with weight, because pet food is where averages mislead. A case of small treat pouches and a case of large kibble bags are both “pet food cases,” but they do not weigh the same, and a palletizer sized to the average will struggle with the heaviest format you actually run. Our rental cells handle cases up to 20 kg (44 lb), so weigh your heaviest filled, sealed case in its shipping configuration and confirm it sits comfortably inside that limit, with margin for variation between fills.

Use the same five sizing numbers we recommend for any line in Pallet Patterns and Case Sizing: case length × width × height, heaviest weight, sustained cases per minute, cases per pallet, and pallet size. List every case format in scope, not just the best seller — small cases for cats, mid-size premium cases and large bulk-kibble cases may all run on the same line end in one week, and each needs its own proven pattern.

Check 2: Plan patterns for cases that can shift

Bagged product inside a case does not behave like rigid bottles or jars. Kibble bags can settle, and a case that left the sealer square can present slightly differently after the conveyor. That is a pattern and grip question, not a reason to avoid automation — but it has to be proved on your real cases. Test the grip and the placement on the actual sealed cases you run, including the heaviest and the most flexible formats, during installation and start-up, not on an empty sample box.

For the pallet itself, favour interlocked patterns over straight column stacks where the case size allows it, especially for heavier cases that will be stretch-wrapped, moved by forklift and stacked in a warehouse. An interlocked layer ties the load together and is more forgiving if individual cases settle. Record the pattern that works for each format as a stored recipe, so the next run of that SKU starts from a proven layout instead of a rebuild from memory — the same recipe discipline we describe in our food plant palletizer guide.

Check 3: Make SKU changeovers a recipe change, not a reset

Pet food plants live on variety. Species, protein, bag weight, can count and promotional pack sizes multiply quickly, and short runs are normal. By hand, every changeover is a chance for the first pallet of the new SKU to be stacked differently from the last. With stored recipes, a changeover becomes a selection, a check of the first case against the pattern, and a clean decision about the part-finished pallet from the previous run.

Settle that sequence before install day: who selects the recipe, how a part-finished pallet is handled when a short run ends, and where full pallets are staged so different SKUs stay separated for warehousing and shipping. Those rules already exist informally — the cell simply needs them written into its changeover sequence.

Check 4: Match the sustained rate through a full shift

Size the cell to the sustained cases per minute your line actually holds over a full run, including pallet exchanges and SKU changeovers, not to the case packer’s short peak. Our typical layout has two pallet stations, one on each side of the robot within its reach of up to 1,880 mm, which helps stacking continue while a full pallet is exchanged. Remember the layout rule as well: a single fixed cobot places to its left and right only; serving four pallet positions takes a linear rail or a second robot.

For the cycle-time math behind sustained rates, see How Many Cases Per Minute Can a Cobot Palletizer Handle? The manual workload behind that math — and why it drives turnover and rework at the line end — is covered in The Real Cost of Hand Palletizing.

Check 5: Footprint, power, air and safety at a busy line end

Pet food line ends are busy: case packers, sealers, forklift lanes and pallet staging all compete for space. A cobot cell is compact by design — a typical cell footprint is about 3,000 × 3,000 mm, with two pallet stations of 1,100 × 1,100 mm, a conveyor infeed at the top centre, 110 V power (max 15 A) and a compressed-air connection. Place the cell where sealed cases already travel, after the case packer or sealer, and confirm it does not block access routes, forklift lanes or emergency exits.

Safety guides and a cage are options fitted when your risk assessment or plant rules call for them; the typical layout includes a safety light curtain on the open side. Our guide Are Cobot Palletizers Safe? walks through that assessment, and Palletizer Installation: What to Expect covers delivery — typically 3–4 weeks — through on-site installation, start-up, recipe creation and operator training. The robot ships on a wooden pallet; receiving it and moving it on site with a pallet jack, at a delivery time coordinated in advance, are the customer’s side of that plan.

Why pet food plants often rent the first cell

Product mixes in pet food change with new formulas, new pack sizes and retail contracts, and a purchased system sized only for today’s heaviest case and today’s SKUs can be the wrong answer for next year’s range. A palletizer rental at $1,999/month with zero upfront, installation and maintenance included, lets a plant prove the cell on its own heaviest case, its own shifting bag cases and its own changeover pattern before making automation permanent. Billing and the term start at installation and start-up, and the cell is tuned to your cases and patterns at install. If you are weighing that against a purchase, Palletizer Rent vs Buy and our pharmaceutical palletizer guide show the contrast clearly — pharma at the lighter, high-changeover end, pet food at the heavier, still high-changeover end.

The bottom line

For a pet food manufacturer, the fit check is five questions: Have you sized to the heaviest sealed case, with every format in scope listed? Have you proved the grip and an interlocked pattern on your real, shifting cases? Are SKU changeovers handled by stored recipes with a clear rule for part-finished pallets? Can the cell hold your sustained rate through pallet exchanges? And is about 3,000 × 3,000 mm, 110 V power and air available at the line end? Answer those, and a pet food palletizer becomes a practical next step: consistent, repeatable pallets of heavy cases, without hand-stacking a single one.