Pet owners brought rabbits, cats and dogs to get vaccinations and microchips at the RSPCA branch in West Norwood on Sunday.
David Mawson, volunteer at the branch, said 121 pets were vaccinated and 65 were micro-chipped.
Mr Mawson said: "We had a fantastic clinic yesterday. The next event is in October."
The clinics are a joint initiative with vets Easipetcare.
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