Love animals but working with a tight budget? The purchase price — or adoption fee — is only the beginning. Food, housing, vet care and supplies add up every single year, and the cheapest pet to buy is not always the cheapest to keep. This guide ranks popular pets by what they really cost, year after year.
Short Answer
The cheapest pets to keep are small animals with simple needs: betta fish, hamsters, budgies and guinea pigs typically cost $200–$600 a year after setup. By contrast, vet-school and ASPCA estimates put a cat at $800–$1,300 a year and a medium dog at $1,400 or more — every year for a decade or longer.
By The PawPilot Team · Updated 3 November 2026 · 8 min read
In this guide
The cheapest pets, ranked
Annual costs below are estimates drawn from ASPCA, vet-school and university extension guidance, and cover food, bedding or substrate, basic supplies and routine vet care. Emergency vet bills can raise any of these figures.
| Pet | Typical annual cost | Lifespan | Notes |
|---|---|---|---|
| Betta fish | $150–$300 | 3–5 years | Needs a heated, filtered tank — not a bowl |
| Hamster | $300–$500 | 2–3 years | Bedding and food are the main ongoing costs |
| Budgie (parakeet) | $300–$450 | 8–15 years | Cheap yearly, but a long commitment |
| Guinea pig | $500–$800 | 5–7 years | Hay and fresh veg add up; keep in pairs |
| Rabbit | $800–$1,200 | 8–12 years | Spay/neuter and hay are the big costs |
| Cat | $800–$1,300 | 13–17 years | Litter, food and preventive vet care |
| Small dog | $1,000–$1,600 | 10–15 years | Food, grooming and vet care scale with size |
| Medium dog | $1,400+ | 10–13 years | The ASPCA’s benchmark figure, excluding emergencies |
First-year setup vs ongoing costs
The first year is almost always the most expensive: enclosures, tanks, carriers, spay/neuter surgery and initial vaccinations all land at once. Budget for setup before bringing a pet home.
| Pet | Typical setup cost | Biggest setup items |
|---|---|---|
| Betta fish | $60–$120 | Tank (5+ gallons), heater, filter |
| Hamster | $80–$160 | Cage, wheel, hides, bedding |
| Budgie | $100–$200 | Flight cage, perches, toys |
| Guinea pig | $150–$300 | Large enclosure, hides, hay rack |
| Rabbit | $200–$400 | Hutch or pen, litter box, spay/neuter |
| Cat | $300–$600 | Carrier, litter boxes, scratching post, spay/neuter |
| Dog | $400–$800 | Crate, bed, lead, collar, spay/neuter, training |
Buying second-hand enclosures and tanks can cut setup costs sharply — just disinfect everything thoroughly before use.
The true lifetime cost
Multiply the annual figure by the years you will share, and “cheap” pets look different. A budgie’s long life can make it pricier overall than a hamster’s short one.
| Pet | Estimated lifetime cost |
|---|---|
| Hamster | $1,000–$1,700 |
| Betta fish | $700–$1,600 |
| Guinea pig | $2,700–$5,900 |
| Budgie | $3,400–$6,950 |
| Rabbit | $6,600–$14,800 |
| Cat | $10,700–$22,700 |
| Medium dog | $14,400–$20,000+ |
These are planning estimates, not quotes — vet emergencies, which extension services say affect around half of pet owners at least once, can add thousands to any row.
Hidden costs that catch owners out
- Pairs and groups: guinea pigs, rats and many birds must live with companions — double the food and vet bills.
- Exotic vet fees: rabbits, reptiles and birds often need specialist vets, whose consultations cost more than a standard cat-and-dog practice.
- Holiday care: a sitter for a dog can cost $40–$80 a day; even small pets need paid care when you travel.
- Electricity: heated tanks and heat lamps run 24/7 — check what that adds to your power bill.
- Replacements: chewed leads, worn cage liners and outgrown tanks are easy to forget in a budget.
What would your pet really cost per year?
Choose a species, add your local prices, and see a personalised annual estimate.
Is a low-cost pet right for you?
Cost is only one part of the decision. Hamsters are nocturnal and prefer handling on their own terms; budgies need daily interaction and can be noisy; guinea pigs and rabbits need space and companionship. The “cheapest” pet is a poor choice if its needs do not fit your home, schedule and temperament. Choose the pet whose daily care you will genuinely enjoy — that is what keeps long-term costs down, because neglected pets develop expensive health and behaviour problems.
Frequently asked questions
What is the absolute cheapest pet to own?
A single betta fish in a properly heated and filtered tank is usually the cheapest vertebrate pet to keep, at roughly $150–$300 a year. Sea monkeys and ants are cheaper still, if they count.
Are rescue pets cheaper than buying from a breeder?
Almost always: adoption fees ($50–$300) are far below breeder prices and usually include spay/neuter, vaccinations and a health check. See our adopting vs buying cost comparison.
Do small pets need vets?
Yes. Rabbits need vaccinations and spay/neuter surgery; birds and reptiles benefit from annual check-ups; and any pet can fall ill. Budget at least one vet visit a year for every species.
Can I keep costs down with pet insurance for small pets?
Insurance is widely available for dogs and cats but rare for small mammals, birds and fish. For those species, a small dedicated savings pot works better.
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