I am a breeder of Chihuahuas, Pomeranians, Poodles & Dachshunds. I handle my pups from birth.
my advice is that nobody can.Not even at a certain age but a veterinarian can.If you have a puppy take it to the vet.You will know if it is sick or not.
10 weeks is the best age to buy
Probably when it stops breastfeeding from its mom
A puppy should be weaned by eight weeks so they should be on a puppy mixer by 5-6 weeks.
At a similar age to when you had your coccyx severed.
Minimum of eight weeks old, they should be weaned by then.
You should feed your 6 month puppy a good, high quality puppy food until it is one year of age. I would suggest Purina Puppy Chow or Science Diet Puppy food.
A dog is a puppy until it reaches one year of age.
Age does't matter so much. If he's housebroken it will be alot easier for you.
you should change it's food at age two to adult food
At that age you can start him on adult dog food.
At that age they should be drinking their mothers milk. If they are orphaned, a milk replacement should suffice.