Last Updated: 23/11/2025
Hill's Science Diet Product Updates
Discover information on the latest changes and enhancements to Hill's pet food products, including ingredient updates, new formulations, and packaging improvements.
Author: Dr Belinda Stancombe BVSc (Hons)
Reading Time: 3 minutes - short read
From October 2025 through to mid 2026, you will notice some changes to the Hill's Science Diet Specialty range.
These changes are part of Hill's continued efforts to increase the palatability of their range and their commitment to providing pets with high quality, science-led nutrition.
Changes to the Hill's Specialty dry products include minor formulation upgrades, and a change to the kibble size and shape in some cases. The back of the pack has also changed, so this can be a good way to tell if you've received an updated formula.
In all cases, a 7 day transition from the old formula to the updated formula is recommended, to avoid dietary upset.
FAQs
Which products are being updated?
Dog Hills Specialty Diets
Please use the tabs above to find out what's changing in your dog's diet.
Cat Hill's Specialty Diets
Please use the tabs above to find out what's changing in your cat's diet.
Ensure a Gradual Transition
Because the ingredients of these products have changed slightly, to avoid any dietary upsets, we recommend that you gradually transition your pet from the old to new formula over a period of 7 to 10 days.
To make this transition possible, we recommend keeping approximately a week's worth of the old formula in reserve.
For detailed instructions on how to transition your pet's food, please see How to Introduce a New Food to Your Pet.
Previous changes to the Hills diets included the addition of the ActivBiome+ blend to the Hills Science Diet Adult and Senior dry lifestage foods, in mid-2025.
ActivBiome+ is a proprietary blend of prebiotics designed to nourish the gut microbiome.
By supporting beneficial bacteria in the digestive tract, ActivBiome+ supports healthy digestion, promotes balanced stools, and helps maintain a strong immune system - all essential for helping pets feel their best every day.
FAQs
Which products were updated?
The ActivBiome+ mulitbenefit upgrade is being rolled out across the entire Hill's Science Diet Adult dog and cat dry food range and includes all products featured below.
Where can I get help?
If you have any questions or concerns, you can contact our Pet Circle Vet Squad via email or via live chat on the Pet Circle website.
History
Our experts continually monitor the health and wellness space and we update our articles when new information becomes available.
12 Nov 2025
Edited by Dr Gillian Hill BVSc (Hons)
