At around 18 weeks the puppy begins to lose the first baby teeth and permanent dentition appears. This process definitely marks the end of childhood itself. The dog endlessly experiences different social behaviors, and may even begin to rehearse sexual behaviors, trying to ride cushions, other animals, or humans. You can also engage in competitive games aimed at finding out which is the dominant dog. Through play, he learns to communicate his feelings and also to assume (and find out) his own social status.
At around 20 weeks the replacement of baby teeth continues, which can be annoying and painful. The dog may feel an irresistible urge to nibble, thereby trying to relieve tension on its gums. It is advisable to provide plenty of toys and teethers to prevent it from breaking anything else.
At this age, you should no longer have problems urinating and defecating where indicated. Our puppy is almost adult size and the puppy is half its adult weight. During this period you should also teach him everything about hygiene habits, such as bathing, brushing, checking ears, cutting nails, etc. Even if you don't do these tasks, get him used to it by touching these parts frequently to get him used to it.
Towards 6 months is the time that puppies begin to mature sexually and can reach puberty. Basic training can begin. At this age, females may present their first heat. It can be a time of trial and error between the puppy and its owner, as social relationships are completely rethought. Some females may experience sudden mood swings before, during, or after heat. Males often begin to lift their paws to urinate. They do this to delimit their territory and to send the other dogs information encrypted in olfactory signals about their social and sexual situation.
In this period, our puppy undergoes important physical changes, and we may see a somewhat disproportionate appearance, normal due to the growth of its bone and muscular structure. It is important that they eat complete and quality food so that their growth is not compromised.