Is 15 weeks to old to buy a puppy?

i want to buy a bearded collie puppy, this is the first time i've seen these puppies for sale so im scared if i dont buy one i will miss my chance, however there already 15 weeks old. im scared i've missed so much of the puppy life, which is already so short with dogs, as there usually for sale at 8 weeks.... show more i want to buy a bearded collie puppy, this is the first time i've seen these puppies for sale so im scared if i dont buy one i will miss my chance, however there already 15 weeks old. im scared i've missed so much of the puppy life, which is already so short with dogs, as there usually for sale at 8 weeks. have i missed too much!? there breeder isnt lowering the price due to age either so im just not sure...
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