As the title says I am trying to figure out if I should have a Yorkie as a new member of our family, and I am hoping this forum can help me decide.
I guess I should start by telling a little about myself. I am 32, I share my life with my boyfriend (we are together for 11 years) and we just bought a townhouse, so we started to think about getting a dog. We both love dogs and cats, he had a dachshund and a stray tom cat growing up, I used to have a tom cat and 1 dog in my home country (my parents are taking care of them now). We do not plan to have human kids in the near future so it would be nice to have a canine one

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I work as a software developer (I am out of the house from 8AM until 5:30 PM) and my boyfriend is between jobs right now. I was thinking that him being at home is convenient as he can watch the puppy , but I am not counting on this as we are hopping he finds a job soon, and getting a puppy is not something you do in a week.
The reasons I choose a Yorkie are :
1. We don't have a yard, so exercise needs should be met by running around the house (1700 sq ft on one level) and daily walks.
2. They are very cute and intelligent
3. Long life span
So I have a lot of questions, probably I will forget to list a lot of them, but here is a start.
1. Should we get one puppy or 2? I was thinking us being out of the house for so long they would keep each other company, but not sure if that will be enough
2. How sensitive are Yorkies to travel? The main reason we want a dog (and not a cat) is because generally dogs are ok travelling, while cats get very stressed. We go back home every Christmas, and that is normally a 14-16 hour trip by plane, and I want to take him/them with me.
3. How much does a puppy cost (from a responsible breeder)?
4. I read the "Before Buying a Yorkie: Vet Costs" thread, but was not clear how much of that cost is with or without insurance, and if there are insurance s that cover more (or everything as a HMO for humans).
Thanks for all the answers, and don't be shy if you find something that I need to correct on my assumptions. Also a list of responsible breeders in Chicago area would be welcomed.