When a puppy begins to show signs of thrusting and mounting, there is no predetermined age. A dog’s sexual nature does not emerge until it reaches sexual maturity, which can take anywhere from 6 to 18 months. Puppies younger than 6 months may try to mount other dogs, toys, or people as a game, or to explore with sexual behaviour.
Mounting and thrusting are sexual behaviours used by dogs who have reached sexual maturity. Even after being neutered, a dog may show signs of thrusting. When a dog is enthusiastic, wants to display dominance, wants to play, or has developed a compulsive habit of thrusting, he or she will mount.
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