I use a wellness plan through Banfield Health. Its not exactly an insurance plan, but its close to it. I pay $30/month and that fee includes two comprehensive visits every year when they do a wide range of preventative health measures (blood work, fecal analysis, diagnostics, vaccines, etc). Its $40/month for the first year when they are a puppy, then drops to $30 after that because of all the vaccines they need. I see the full bill every time I take her in, and the out of pocket cost justifies having it. It also includes 25% of all other services, like if you need emergency health care, grooming, toe nail clipping, ear/teeth cleaning, etc. Last November, my dog cut her leg while hunting and she needed surgical staples put in. They moved me right to the front of the line to get it done in 15 minutes. They cleaned the wound out to mitigate infection, and applied 8 surgical staples that they removed 12 days later and she fully recovered.
Additionally, it includes complimentary spaying or neutering the first year too. And they use a laser-guided procedure. No tools or knives or anything that can cause an infection from lack of sterilization.
I have to pay for medication myself, the plan does not cover the cost of that.