Welcome to YT! Great question. So many people don't consider the financial aspect of raising a puppy and owning a dog.
I saw this once and thought it was really interesting...shows low-high costs on average of owning a dog
http://www.peteducation.com/article....articleid=1543
I currently have one yorkie (and I'm dogsitting my parent's yorkie right now). It's expensive to own a puppy at first. They need to go to the vet however many times until vaccinations are complete - can be close $50-$100 each visit. Spay/Neuter - anywhere from $100-$400 depending on vet and what pre-op work you have done. Yorkies normally need baby teeth pulled as they commonly don't fall out on their own - anywhere from $50-$200 depending on vet and whether or not you do it at same time of spay. You'll also have to buy a lot of supplies at first - crate or x-pen, blankets, toys, chew toys, brush, shampoo, conditioner, harness, leash, collar, potty pads, microchips, ID tags, bed, etc. (price varies)
Food - I feed Nature's Variety Raw and spend about $40 a month to feed only Lacy
Grooming - if I didn't do it myself, it would cost me $40 a month
Bullystix & treats - $20 a month
Heartworm preventative - $5 a month
Flea preventative - $15 a month
Shampoo & Conditioner - $20 once every 4 months or so
Annual Vet checkup - $100-$200 depending on what is done
And I spend ALOT on unnecessary things like clothing, toys, carriers, etc...(not going to put amount here
)
It's also a good idea to consider vet costs for medical problems that may arise. Last October Lacy had a Urinary Tract Infection that cost me about $300 to treat. Today I discovered my parent's yorkie had tapeworms so I took him and Lacy to the vet for fecals and an exam - $75 (would have been $150 but I got a really good discount today). Lacy also has Luxating patellas (common to toy breeds) which may cost me $1500 for surgery one day. Many yorkies end up having liver shunt unfortunately - hundreds - thousands of dollars to do surgery on. Broken bones/accidents - hundreds to thousands of dollars. Yorkies commonly need teeth cleaned by a vet - a few hundred dollars. So it's always good to make sure you have money in case something arises and you owe large vet bills.
Good Luck