Pro Plan Veterinary Diets OM St/Ox Obesity Management Dry Cat Food

£14.50 – £31.99 From £6.40 per kg
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  1. 1.5kg
  2. 5kg
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This is a specialist veterinary product. We will ask you a simple set of questions to confirm that you are buying the correct medicine for your pet and know how to use it safely

Warning: By law we cannot sell this product to anyone under 18, by placing an order with us you are confirming that you are over the age of 18.

Order by 3pm for Express Courier Delivery  Some of the items we sell are a bit too bulky to fit on our delivery vans so we offer our customers Next Day Delivery via courier. Deliveries are made from 8am - 8pm Monday to Saturday and 9am - 5pm on Sundays. Your delivery slot will only be confirmed once your order has been placed.

PURINA® PROPLAN® VETERINARY DIETS OM St/Ox Obesity Management is a complete veterinary diet for weight loss in obese cats. OM is low in fat and calories whilst being high in protein to encourage steady and effective weight loss while maintaining muscle mass. Made with high levels of natural fibre and protein to help your cat feel full and satisfied. Once ideal weight is reached, your cat can continue to be fed OM to help maintain ideal weight.

Key Benefits

High protein level to help promote loss of body fat while maintaining muscle mass
Low calorie diet to help with weight loss
Help minimise struvite and oxalate urinary stone formation, more common in overweight cats
With St/Ox to help support urinary health in cats which may be susceptible to urinary conditions

Product Information

Veterinary Clinical Nutrition
ISFM  | International Society of Feline Medicine
ISFM recognises PURINA's nutritional contribution to feline well-being.

Recommended for

Adult cats aged 1+ years who are overweight to help make losing weight easier and once the ideal weight is reached, keeping the weight off.

PLEASE NOTE: Not recommended for cats that need a higher calorie intake such as pregnant queens or growing kittens.


Maize Gluten Meal, Wheat Gluten Meal, Soya Meal, Dehydrated Poultry Protein, Wheat Flour, Pea Fibre, Digest, Minerals, Animal Fat, Fish Oil, Yeast


Typical Values Analytical constituents:
Protein: 48.0%
Fat content: 8.0%
Crude ash: 8.0%
Crude fibres: 7.5%
Energy value: 3.4 kcal/g
Nutritional additives: IU/kg:
Vit A: 36000
Vit D3: 1200
Vit. E: 650
Taurine: 1000
Ferrous sulphate monohydrate: (Fe: 81)
Calcium iodate anhydrous: (I:2.0)
Cupric sulphate pentahydrate: (Cu: 12)
Manganous sulphate monohydrate: (Mn: 38)
Zinc sulphate monohydrate: (Zn: 130)
Sodium selenite: (Se: 0.12)


Drinking water should always be available. The feeding amounts below are recommended as a guideline only. Ask your vet how much you should be feeding your individual pet.

Feeding Guide

For Weight Loss:

Weight (kg)
per Day
4kg 60g
6kg 95g
8kg 125g
10kg 155g
12kg* 185g
*For each additional kg of body weight, feed an additional 15g of dry food per day.

For Weight Maintenance:

Weight (kg)
per Day
4kg 75g
6kg 115g
8kg 155g
10kg 195g
12kg** 215g
**For each additional kg of body weight, feed an additional 20g of dry food per day.

Safety Advice

Please note that all indications for PURINA® PRO PLAN® VETERINARY DIETS mentioned in this page are for the dietary support of cats and dogs with the listed conditions and do not preclude appropriate medical management. The VETERINARY DIETS should be used under veterinary supervision.