It's important to feed your dog a formula that meets [his / her] specific life stage requirements. (bluebuffalo.com)
They offer a wide variety of dry and canned food products for dogs, many of which are designed for dogs in specific life stages or with certain health needs. (pawster.com)
Researchers now think that in female animals, the presence of estrogen promotes female development at specific life stages, and having a second X chromosome makes female brains different from those of males. (discovermagazine.com)