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Phantom balls: do dogs & cats miss their balls after neutering? Read before early spaying/ neutering a puppy or kitten.
What Age Should You Spay Your Dog? | PetMD
Will my dog be any different after neutering? - Quora
Neutering – the why and when we do it! – Briarhill Veterinary Clinic
Frontiers | Assisting Decision-Making on Age of Neutering for 35 Breeds of Dogs: Associated Joint Disorders, Cancers, and Urinary Incontinence | Veterinary Science
Spaying Your Female Dog: What You Need To Know - DogTime
Best Age To Neuter Or Spay A Dog - Cesar's Way
Dog Castration: a step by step guide to the operation
Dog Neutering or Spaying A Dog: Pros and Cons (Backed by Science)