By ABC-7 Reporter Daniel Marin

EL PASO, Texas -- This year, close to 600,000 Americans will die of cancer, but the silent killer is even deadlier when it comes to animals.

Many pet owners are surprised to find out just how expensive their vet bills can get. Pet health insurance is an option that is growing in popularity.

"The general public may not understand that dogs are at risk," said veterinarian Patricia Olson. "[Cancer] is a very significant disease and one that causes great pain."

While cats are susceptible to some forms of cancer, dogs seem to be more at risk, particularly the older they get. And fast-spreading bone cancer is the most rampant form.

"Unfortunately, in dogs it tends to move very rapidly without care," said Brandy Gardes, executive director of From the Heart Animal Rescue in Canutillo. She takes care of a lot of animals, most with special needs.

Just a few weeks ago she had to put down a dog she had grown to love, because of cancer. "Most people think Fluffy, their best friend, is going to die of old age. Wrong," she said.

Like any kind of insurance, there are a lot of companies that offer a lot plans. Most cost 20 to 40 dollars a month, depending on your dog's age.

The companies can cover cancer treatments like chemotherapy, regular check-ups or other unexpected pet bills.

When Gardes' Great Dane tore its ACL, the bill was $3,000, a big hit on any budget, but due to pet health insurance she only paid $75.

But in turbulent economic times, when so many don't even have health insurance for themselves or their children, is it realistic to ask someone to spend the money they scrape together on an animal?

Gardes says the decision is, of course, up to every owner. But as for Gardes, she says, "Those decisions need to be made on love, not finances."

As with any insurance, it's always smart to do your homework and check out different companies to see which plan fits you and your pet best.