The site is home to IPN’s subsidiary, The Real Petfood Company.
The investment will go towards funding for new production and robotic equipment, additional storage and racking and employee safety initiatives.
Additional mincing equipment will also be installed, which will allow the company to take “full advantage” of the growing trend for paté-style wet dog food.
Having originally sourced this ingredient from third parties, the company will now have “complete quality control” over the entire manufacturing process.
Manual stacking and product wrapping will also be removed through the installation of additional robotic equipment, increasing product efficiency by some 20%.
Warehouse storage space has also increased by 50%, enabling it to increase its pallet storage capacity by 40% to 4,600 pallets.
The firm said it is “committed” to growing sales, with the aim to increase its current yearly sales of £15m to £25m over the next two years.
James Lawson, managing director of The Real Petfood Company, said: “Our wet food tray products under the Wagg and Harringtons brands are performing extremely well with customers appreciating our FreshCook technique, where ingredients are cooked just once to ensure the full nutritional value is maintained.
“Sales of Harringtons wet pet food are particularly strong and during the past 12 months have risen more than 30%.”
He added: “The continued investments enable us to increase production, achieve even greater levels of efficiency, store more product and, ultimately, supply super quality FreshCook products at lower cost.”