Not sure of your "must haves".... I encourage buyers to come out to our kennel with an open mind rather than having specifically set on a sex or size since we require alteration by 6 mo anyway..... That said, look for a puppy that responds well to you personally.... You shouldn't be rushed to choose..... I give buyers a chance to stay and play as much as they need or to come back several times to choose the right dog..... Every puppy has a unique personality just like people, so get to know each dog in the litter. Everybody has a bad day, so don't base your choice on the 1st visit unless distance is a factor, then rely on your breeder to really be able to give a good personality analysis of each puppy. That aside, there are some basic kennel and puppy qualities we recommend buyers take a moment to peruse prior to choosing..... read over our link and maybe it will give you some insight...
South East Texas Yorkies - Choosing a Puppy