So, I realize I'm a bit late on the conversation. Some thoughts from a vet student's perspective:
There are frugal ways to take care of pets; you just have to be careful how you do it. Encouraging people to go to the feed store and get livestock-grade ivermec is a terrible idea. If the concentration changes, your dog has collie somewhere in its background you don't know about (I'm going to refrain from the genetics of the MDR1 gene, but I will admit I'm a nerd and love to talk about it), if you don't look up or calculate the dosing correctly, your dog could die. I've seen too many people whose dogs have gone into seizures, comas, or died because someone forgot one of those little details. Obviously, the badasses in this forum wouldn't do that, but it's just not a good idea to mess with.
You should also talk to your vet about what diseases are in your area. Some locations don't really need lyme vaccines for their pets, others don't need bordetella, etc., depending on where you go and what you're doing with your dog. You can also have your vet walk you through the vaccines you get at the feed store (how to give them, what to get, etc.), but if you do that, keep the lot numbers, expiration date, and date/dose given so that if anything happens you've got the records to go from. Rabies vaccines are trickier and usually have to be done by a vet, but there are low-cost clinics everywhere if you look for them (some will even do low-cost spay/neuters).
Dogs are by nature scavengers; feeding them leftovers that are high-quality and balanced can be done, but once again you have to be careful that you're giving them a balanced meal. Overfeeding dogs can shorten their life by 2 years and make them prone to a host of other problems, even if they don't look like a blown-up balloon yet. And, as others have pointed out, it's totally Anti-Mustachian to waste all of that food/money on something that's easily preventable.
If you're dead-set on an animal, the shelter is actually the Mustachian way to go: an already vaccinated animal that's spayed or neutered and may even have had previous socialization and training (ours had already been through obedience and was house trained). And usually all that is only $50-100. If you had to provide that care yourself, it would cost much more. The caveat is that you don't know what the animal's history/genetics are, but I'm willing to live with that.
My husband made us calculate up the cost of the dog we have now (60 lb. collie mix) before he would even go to the shelter with me. Our number is about $750 a year right now, but adding the cost of vet care if I couldn't provide it myself easily pushes it up to $1000.
(And for the record, vets don't see dollar signs with pugs. They see them with English bulldogs. ;) )