Changing Pet Food Doesn’t Have to Be Complicated
There are many reasons you might decide to change your dog or cat’s food.
Your puppy may be growing into an adult, your cat may be entering its senior years, or you may simply be looking for a formula that better matches your pet’s current lifestyle.
Whatever the reason, changing food deserves a little planning.
Instead of focusing only on flavour or packaging, consider your pet’s age, activity level, body condition and individual nutritional requirements.
Why Might You Change Your Pet’s Food?

A change may be considered when:
- A puppy or kitten reaches a new life stage
- An adult pet becomes a senior
- Activity levels change
- Your pet’s nutritional requirements change
- Your veterinarian recommends a different diet
- You’re changing between wet, dry or mixed feeding
- A current food is no longer suitable
Josera currently organises its dog and cat foods by life stage, including junior or kitten, adult and senior options.
Choose the New Food Carefully
Before changing anything, determine what you’re actually looking for.
For example, Josera’s current dog range includes categories for sensitive, reduced-fat, hypoallergenic, grain-free and gluten-free foods.
Its cat range includes options for sterilised cats, sensitive digestion, skin and coat, senior cats and other specific requirements.
These categories can help narrow the selection, but they don’t replace individual veterinary advice when your pet has a medical issue.
Understand Your Pet’s Life Stage
Age is one of the easiest places to start.
Puppies and Kittens
Growing animals need nutrition appropriate for development.
Adult Pets
Adult formulas are generally designed around maintenance once growth has finished.
Senior Pets
Older animals may have different nutritional and energy requirements.
Don’t automatically assume that the same food should remain suitable throughout your pet’s entire life.
Make the Transition Gradually
Unless your veterinarian tells you otherwise, changing from one food to another is often approached gradually.
Instead of suddenly removing the old food, introduce the new food progressively.
A transition might begin with mostly the existing food and a smaller amount of the new food.
Over the following days, gradually increase the proportion of the new food while reducing the old one.
Your individual food manufacturer or veterinarian may provide more specific instructions.
Monitor Your Pet
Pay attention to your dog or cat throughout the transition.
Look at:
- Appetite
- Stool consistency
- Digestion
- Energy
- General behaviour
- Body condition
Minor changes don’t automatically mean something is wrong, but persistent or significant symptoms deserve professional attention.
Don’t Keep Switching Foods Constantly
If your pet seems healthy and comfortable on an appropriate complete food, there’s not necessarily a benefit to constantly introducing something new.
Frequent unnecessary changes can also make it more difficult to identify which food works well for your pet.
Choose based on nutritional suitability rather than continually following new pet food trends.
Dry Food, Wet Food or Both?
Changing food doesn’t necessarily mean switching brands.
You may instead be considering another feeding format.
Dry Food
Convenient to measure, store and serve.
Wet Food
Provides additional moisture and can be particularly appealing to some animals.
Mixed Feeding
Some owners combine the two.
Josera notes that when mixed feeding cats, the total daily ration still matters. Combining wet and dry food without adjusting quantities can result in overfeeding.
Pay Attention to Portion Sizes
Changing to a new food doesn’t mean you should automatically serve exactly the same number of grams.

Different foods can have different energy densities.
Check the feeding recommendation for the specific product.
Josera notes that recommended dry food quantities for cats can vary not only according to body weight but also according to the particular recipe.
Use feeding guides as a starting point and adjust appropriately for the individual animal.
Treats Count Too
It’s easy to carefully measure meals and then forget about treats.
Treats still contribute to your pet’s overall daily intake.
During a food transition, keeping everything else relatively consistent can also make it easier to observe how your pet responds to the new diet.
What About Sensitive Pets?
Some dogs and cats require more careful food selection.
Josera currently provides foods categorised around characteristics including:
- Sensitive digestion
- Hypoallergenic formulas
- Grain-free recipes
- Gluten-free recipes
- Reduced fat options
However, symptoms such as recurring digestive problems or skin issues can have multiple causes.
Don’t diagnose a food allergy yourself based solely on symptoms.
Veterinary Diets Are Different
A veterinary diet shouldn’t simply be selected because its description sounds relevant.
Josera’s Help Veterinary Diet range includes formulas intended for particular health concerns.
The company specifically recommends discussing the appropriate diet with a veterinarian or its nutrition professionals before feeding veterinary diet products.
This is particularly important when a pet has an existing medical condition.
Keep Fresh Water Available
Whatever feeding approach you choose, your pet should have appropriate access to fresh drinking water.
This is particularly worth remembering with dry food diets.
Some cats can also be encouraged to drink through multiple water stations or a suitable drinking fountain.
Store Food Correctly
Food quality can also depend on storage.
Keep pet food according to the instructions on its packaging.
Generally, dry food should be protected from moisture, heat and contamination, while opened wet food requires appropriate refrigeration and handling according to the product instructions.
Close packaging properly after each use.
Consider Your Pet’s Activity Level
Two animals of the same weight won’t necessarily require exactly the same amount of food.
Activity can influence energy requirements.
For example, a highly active dog may have different needs from a similar sized dog with a much calmer lifestyle.
This is another reason feeding tables should be treated as guidance rather than a substitute for monitoring your individual pet.
Don’t Judge Food by One Ingredient
Pet food marketing often focuses heavily on individual ingredients.
But one ingredient doesn’t tell you whether the entire diet is appropriate.
Look at the complete formulation and whether the food is intended for:
- Your pet’s species
- Life stage
- Lifestyle
- Individual nutritional requirements
Josera’s standard range follows a life cycle approach, while its Help range is specifically positioned around dietary support for animals with particular health concerns.
When to Contact Your Veterinarian
Speak with a veterinarian if your pet develops persistent:
- Vomiting
- Diarrhoea
- Loss of appetite
- Significant weight change
- Skin problems
- Unusual thirst
- Lethargy
- Other concerning symptoms
A diet change shouldn’t be used as a substitute for investigating an unexplained health problem.
Josera’s Food Range
Josera’s current German store offers food for dogs, cats and horses.
For dogs, its selection includes:
- Dry food
- Wet food
- Treats
- Puppy and junior food
- Adult food
- Senior food
- Sensitive options
- Veterinary diets
For cats, the range similarly includes:
- Dry food
- Wet food
- Treats
- Kitten food
- Adult food
- Senior food
- Specialised nutritional options
This makes it possible to adapt feeding as an animal moves through different stages of life.

Final Thoughts
Changing your dog or cat’s food shouldn’t simply mean replacing one bag with another overnight.
Start by understanding why you’re making the change.
Choose a food appropriate for your pet’s life stage and individual requirements, introduce it thoughtfully, follow the relevant feeding recommendations and monitor how your pet responds.
Most importantly, don’t use food changes to self treat unexplained medical symptoms.
Josera’s broad selection of life stage, sensitive and specialised foods provides options for different nutritional situations, while veterinary guidance remains important whenever health problems influence what your pet should eat.
