
der Welpe
puppy
A young dog or the young of other canine predators such as wolves or foxes.
Unsere Hündin hat letzte Woche sechs süße Welpen zur Welt gebracht.
Our female dog gave birth to six cute puppies last week.
puppy
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puppy
A young dog or the young of other canine predators such as wolves or foxes.
Unsere Hündin hat letzte Woche sechs süße Welpen zur Welt gebracht.
Our female dog gave birth to six cute puppies last week.
'Der Welpe' (the puppy) is a weak masculine noun (N-declension). This means that it takes the ending '-n' in all cases except the nominative singular: des Welpen, dem Welpen, den Welpen. The plural is 'die Welpen' (the puppies).
Ich spiele mit dem kleinen Welpen im Garten.
I am playing with the little puppy in the garden.
The word 'Welpe' (puppy) is used specifically for the young of dogs and other canids such as wolves or foxes. There are separate terms for the young of other animal species.
Im Zoo kann man die Wolfswelpen beobachten.
At the zoo, you can watch the wolf pups.
Common expressions related to puppies are 'einen Wurf Welpen haben' (to have a litter of puppies, when a female dog has several young) and 'Welpen aufziehen' (to raise puppies, to care for the young dogs).
Es ist viel Arbeit, einen ganzen Wurf Welpen aufzuziehen.
It is a lot of work to raise a whole litter of puppies.
boy
Junge refers to a male child or male adolescent, not to a young dog. Welpe means a young dog or the young of another canine predator. The choice therefore depends on whether a person or an animal is meant.

Der Welpe läuft neugierig durch den Garten.
The puppy walks curiously through the garden.
Der Junge läuft neugierig durch den Garten.
The boy walks curiously through the garden.