This means you should feed the mother dry puppy food or a performance diet. We prefer Nutro brand of puppy dry food or performance diet. Male dogs become interested in the girls at between 7 to 9 months old. They will breed a female if she allows them at this age, but she has the final word. Male dogs can be neutered at 6 months old in order to direct their interest towards their owner and away from chasing the girls or fighting with the boys.
Neutering reduces the chance of prostate disease and some of the hormone related cancers of the dog.
Now that you have all the facts of life, you can have that little talk with your dog. You know, the one you've been putting off. But if this is all to embarrassing, you can just have them spayed or neutered. They'll thank-you for it with love and devotion.