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Question:

When switching food do I go by volume or grams?

I really need some advice on switching my dog's food. I’ve been panicking a bit because I want to make sure I'm doing it right. We’re transitioning from kibble to a different brand that’s supposed to help her sensitive stomach. The problem is, I’m completely confused about whether I should be measuring the new food in grams or by using a measuring cup like I used to with the old one. My vet talked about the calories per gram thing but honestly, it went over my head. The bags are different sizes, and their recommended feeding amounts are driving me up the wall because they have different densities. I just want to make sure I’m feeding Luna what she needs without over or underfeeding her. I’d really love to hear how you guys handle this sort of thing. Any tips or insights would be massively appreciated!

Answer:

Hi there! It's great that you're thinking carefully about switching your pet's food. When transitioning to a new diet, it's best to focus on the caloric content rather than strictly using volume or grams, as different foods can vary widely in their calorie density.



Here’s what you can do: start by checking the feeding guidelines on the new food package. Compare the calories per gram (or cup) of both the old and new food. Gradually introduce the new food over 7 to 10 days, mixing increasing amounts of the new with the old.



Watch for any signs of digestive upset, like diarrhea or vomiting. It's normal for your pet to have a mild reaction at first, but if these symptoms persist or if your pet stops eating, it's time to reassess. Also, monitor your pet's weight and behavior to make sure they’re adjusting well to the change.



If you notice lethargy, drastic weight loss or gain, or any severe gastrointestinal issues, it may indicate a more serious problem that needs attention.



Feel free to book a video consult with one of our Dial A Vet specialists if you have more questions or need tailored advice. We'd love to help make this transition smooth for your furry friend!

Answered by

Louise - Senior Veterinary Nurse, Dial A Vet

June 20, 2025

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The "Ask a Vet" forum on Dial A Vet offers general information and helpful tips on pet health, but it's not a substitute for professional veterinary care. The advice here doesn't create a veterinarian-client-patient relationship, and our vets can't diagnose or treat your pet remotely. For emergencies or specific medical concerns, always contact your local veterinarian immediately. Your pet's health is unique, and decisions should only be made after consulting with a qualified professional. By using this forum, you acknowledge these limitations and agree to seek in-person veterinary advice for all your pet's health needs. View our content guidelines.
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