Derby is just under the 12 week rule, but only by a pound and a half approx. he fluctuates between 10-11 pounds.
I think it's to say you aren't going to have a small size dog.
it's ok though, once he grows up a bit he'll be fine playing with other one. he's just very much a puppy right now and they play a bit rough at that age (with sharp puppy teeth!). he'll start to lose them soon.
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