Neutering Your Dog
Neutering your dog: what changes, and the feeding adjustment most owners miss
Neutering settles a lot. It also drops a dog's energy needs almost overnight while appetite stays the same, which is why the two years after surgery are the highest-risk window for weight gain.
What neutering does
In males, castration removes the testicles and the testosterone they make. In females, spaying removes the ovaries and usually the womb. Both end the ability to breed and remove the hormone-driven behaviours: roaming, marking, seasons, phantom pregnancies, and the risk of pyometra and testicular cancer. Neither is a cure for behaviour problems that are learned rather than hormonal, and in some large breeds vets now recommend waiting until growth is complete. The timing is a conversation with your vet, breed by breed.
The weight window
A 2013 study of neutered dogs found that weight gain was most likely in the two years after surgery, regardless of the age at which it was done. Metabolism slows and the drive to move drops; the bowl does not. Owners who keep feeding the same ration see the change on the scales within months.
By around 10 to 20%, or switch to a lighter recipe. Do it the week they come home, not when the vet mentions it a year later.
Catching a kilo is easy; catching five is a project. The rib check.
Post-surgery sympathy treats are how most of the extra weight arrives.
Once healed, the walks should be at least what they were.
Coat and skin
Some neutered dogs, particularly spaniels and setters, grow a softer, thicker "puppy coat" after neutering. It is hormonal, harmless, and best managed with grooming and the omega fatty acids in a good diet.
Recovery
Lead walks only for ten to fourteen days, a cone or suit to stop licking, and small meals for the first day or two if the anaesthetic has left them queasy. Most dogs are back to normal within a fortnight.
Light Calorie ControlCalorie control
Mini LightUnder 10 kg
Low Fat Duck & Salmon (Toscana)Low fat
Healthy Weight Care SnackLow-calorie snack
- the right age for your breed and size, especially large and giant breeds
- any behaviour you hope neutering will fix; some it will, some it will not
- weight, at every check-up in the two years after surgery
Weight-gain findings from "Diet management strategies" by Cornelia Günther, veterinarian, Happy Dog veterinary team (Lefebvre et al., JAVMA 2013). General information, not a substitute for veterinary advice.
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