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Surgery

Spaying and Neutering: What to Expect Before and After Surgery

What actually happens on the day, how to prepare, and how to nurse your pet through a smooth recovery.

By Dr Hana LindqvistVeterinary review: Dr Elena Marsh7 min readPublished 2026-09-29Updated 2026-09-29
Veterinarian gently examining a dog in a bright clinic

Why neutering is recommended

Neutering — castration for males, spaying for females — is among the most common operations vets perform. It prevents unwanted litters and, for many species, reduces the risk of serious disease: spayed female rabbits, for example, are protected from the womb cancer that otherwise affects most unspayed does.

Before the day

A little preparation makes the day smoother.

  • Follow your vet's fasting instructions exactly — usually no food from the evening before for dogs and cats; rabbits must NOT be fasted
  • Book time off or arrange help for the first day or two of recovery
  • Prepare a quiet, clean recovery space away from other pets
  • Ask about pre-anaesthetic blood tests, especially for older animals

On the day

Your pet is admitted in the morning, examined, and given a general anaesthetic with monitoring throughout. Most animals go home the same afternoon, sleepy but comfortable, with pain relief and written aftercare instructions.

Recovery at home

Most recoveries are straightforward with quiet care.

  • Keep the animal quiet and rested; lead walks only for dogs, typically for 10–14 days
  • Use the buster collar or medical suit provided — licking reopens wounds
  • Check the wound daily for redness, swelling or discharge
  • Feed a light meal the first evening; appetite should be normal within a day or two
  • Attend the post-op check even if everything looks fine

Call the vet if you see

A pet that will not wake properly, repeated vomiting, a wound that opens or oozes, refusal to eat beyond the first day, or a rabbit that stops eating or produces no droppings — rabbits need same-day attention.

Timing

The best age varies by species, breed and individual — large-breed dogs in particular may benefit from waiting until they are physically mature. This is a conversation to have with your vet, not a rule to read off a chart.

Dog and cat body condition progression from underweight to obese
Body condition is assessed by touch as well as appearance. Ask your veterinary team to score your individual pet.

Frequently asked questions

Will neutering change my pet's personality?
It reduces hormone-driven behaviours such as roaming, marking and some mounting, but it does not change who your pet is. It is not a fix for training or behaviour problems.
Is it safe for older pets?
Age alone is not a barrier — many older animals are neutered safely after a health check and blood tests. Your vet will weigh the individual risks and benefits.

References

  1. PDSA — neutering advice — https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub/other-veterinary-advice/neutering-your-pet
  2. RSPCA — neutering — https://www.rspca.org.uk/adviceandwelfare/pets/general/neutering