Sex

Between the ages of six and twelve months, dogs, especially American Cocker Spaniels, acquire sexual maturity and are able to go into their first heat cycle. On the other hand, different dogs may need different amounts of time. The Cocker Spaniel, being a smaller breed, often goes into heat first, before bigger breeds.

Estrus, the mating season for American Cocker Spaniel females, typically occurs twice yearly, however it might happen more often. The phases of the estrus cycle are diestrus, estrus, and proestrus. In the first stage, known as proestrus, a female may show symptoms of bleeding or discharge but is otherwise not ready to mate. The next best time to reproduce is during estrus, when the female becomes open to mating.

The sexual maturity window for male American Cocker Spaniels typically opens between six and twelve months of age. Having reached sexual maturity, however, is no guarantee that they are ready to procreate. One to two years of age is often considered the sweet spot for a dog's mental and physical maturity, so it's best to hold off.

Responsible dog ownership requires serious consideration of the topic of breeding. The purpose of breeding should be to improve the breed as a whole, and anybody considering becoming a breeder should be well-versed in the breed standard, genetics, and the care required of the mother dog, the father dog, and any offspring. Furthermore, when breeding dogs, it is important to do so in an ethical manner that puts their health and happiness first.

To be sure you're doing what's best for the dogs and the breed as a whole, it's smart to talk to a vet or a professional breeder before you breed your American Cocker Spaniel.