Obesity in Cats

Many cats gain weight gradually, so it can be difficult to recognise initially. 

Signs to look for include: 

• Weight gain or an increase in body size 

• Difficulty feeling your cat’s ribs 

• Loss of a visible waist 

• Reduced activity or reluctance to jump and play 

• Sleeping more than usual 

• Difficulty grooming, leading to poor coat condition 

Obesity usually develops when a cat consumes more calories than they burn. 

Common contributing factors include: 

• Overfeeding or frequent treats 

• Lack of activity and stimulation, especially in indoor cats 

• Neutering, which can reduce calorie requirements 

• Age-related changes in metabolism and activity 

In some cases, weight gain may be linked to underlying health conditions or certain medications. 

Excess weight can have a significant impact on your cat’s health and wellbeing. 

Obesity increases the risk of: 

• Diabetes mellitus 

• Arthritis and reduced mobility 

• Urinary tract problems 

• Grooming difficulties and poor coat condition 

Overweight cats may also have a reduced quality of life and can be more prone to other health issues. 

If you are concerned about your cat’s weight, we recommend booking a check-up. 

You should contact your vet if: 

• Your cat is gaining weight 

• You are unsure what your cat should be eating 

• Your cat is less active or struggling to move comfortably 

• You would like support with a weight loss plan 

Early advice can help prevent more serious health problems and make weight loss safer and more effective. 

Obesity is usually diagnosed based on your cat’s weight and Body Condition Score (BCS). The BCS is a simple way of assessing whether your cat is underweight, ideal, or overweight by looking at their shape and how easy it is to feel their ribs and waist. 

Your vet will: 

• Weigh your cat 

• Assess their Body Condition Score 

• Discuss diet, lifestyle, and activity levels 

In some cases, further tests may be recommended to check for any underlying health conditions. 

Weight loss in cats should be gradual and carefully managed. 

Treatment usually involves: 

• Feeding a measured, calorie-controlled diet. A specific weight-loss diet may be recommended, rather than simply feeding less of a regular diet 

• Weighing food rather than estimating portions can improve accuracy and support weight loss 

• Reducing treats and avoiding overfeeding 

• Ensuring consistency between all members of the household 

• Encouraging more activity through play, food puzzles, or climbing (e.g. cat trees) 

• Regular weight checks to monitor progress  

Your vet may recommend a specific weight loss diet and help create a tailored plan for your cat. Rapid weight loss should be avoided, as this can be dangerous in cats.  

Further reading: What can my cat eat

Maintaining a healthy weight is easier than achieving weight loss. 

You can help prevent obesity by: 

• Feeding a measured amount of food appropriate for your cat 

• Limiting treats and avoiding feeding human food 

• Encouraging regular play and activity 

• Monitoring your cat’s weight and body condition 

Regular vet check-ups can help identify small weight changes early. 

With the right support, most cats can achieve and maintain a healthy weight. Gradual, controlled weight loss is the safest and most effective. Many cats go on to become more active, comfortable, and enjoy a better quality of life. Ongoing monitoring and regular check-ups are important to help maintain a healthy weight long-term.