The phrase "puppy stage" refers to the initial period of a dog's life when they are still very young and playful, typically around the first few months or year. Full definition
Use praise, toys and food to motivate your dog from puppy stages through the advanced levels of training. (puppy-training-solutions.com)
Breed is also important, especially at puppy stage. (mypetneedsthat.com)
This is particularly important in puppy stage where their smaller mass and less developed immune system can result in more serious and faster effects. (huskypuppiesinfo.com)