1. opacification-the process of becoming cloudy or opaque. natural action, natural process, action, activity-a process existing in or produced by nature (rather than by the intent of human beings); the action of natural forces; volcanic activity.Translations.. opacification-the process of becoming cloudy or opaque. natural action, natural process, action, activity-a process existing in or produced by nature (rather than by the intent of human beings); the action of natural forces; volcanic activity. Translations.
A booster is a repeat of a previous vaccine that the dog has already received. The goal of the booster is to boost the dogs immunity up to an effective level. Older dogs need boosters every 1-3 years because otherwise their immunity would start to drop.
What Are âCoreâ Vaccines? The American Animal Hospital Association (AAHA) publishes guidelines that classify vaccines as core, non-core and not recommended. Core vaccines are those that the AAHA and most veterinarians believe that all dogs should receive. Core vaccines usually are given in a short series starting at 7 or 8 weeks of age, followed by boosters at varying intervals.