Common Mistakes New Small Pet Owners Make

Small pets seem simple. Put them in a cage with some bedding and food, and you're done, right?

Wrong. Small pets are actually more complex than people expect, and the same mistakes are made over and over—often with fatal consequences. Here's what new small pet owners get wrong, and how to do it right.

Mistake #1: The Cage Is Too Small

This is the universal small pet owner mistake. Pet stores sell cages that are far too small because they're cheap and stack well on shelves.

Minimum Cage Sizes

That cute little cage at the pet store? It's probably a third of the minimum size.

Signs Your Cage Is Too Small

• Bar biting (hamsters, rats)
• Excessive digging at corners
• Lethargy or depression
• Aggression
• Repetitive behaviors (running the same pattern)

The Fix

• Research proper sizes before buying
• Consider bin cages (DIY from storage bins)
• Invest in a proper enclosure upfront—it's cheaper than replacing too-small cages

Mistake #2: Wrong Bedding

Using unsafe bedding is shockingly common—and incredibly dangerous.

Bedding to NEVER Use

Cedar shavings: Toxic phenols damage the respiratory system and liver. Causes early death.

Pine shavings: Also contains phenols, though less than cedar. Not worth the risk.

Fluffy "bedding" (cotton-like nesting material): Causes intestinal blockages if eaten and can wrap around limbs, cutting off circulation.

Cat litter: Clumping litter expands in the stomach if eaten. Fatal.

Corn cob bedding: Molds easily, can cause impaction if eaten.

Safe Bedding Options

• Paper-based bedding (Carefresh, Clean & Cozy)
• Aspen shavings (the one safe wood option)
• Hemp bedding
• Fleece liners (for guinea pigs and rabbits)

Mistake #3: Inadequate Diet

"Just give them pellets" is dangerously oversimplified.

Hamsters

Common mistake: Seed-only diet Reality: Need a mix of quality seed mix, pellets, fresh vegetables, and occasional protein

Guinea Pigs

Common mistake: Thinking pellets are enough Reality: Need unlimited hay (80%+ of diet), daily vitamin C (they can't make their own), fresh vegetables, and limited pellets

Rabbits

Common mistake: Pellet-heavy diet with carrots Reality: Need unlimited hay (80%+ of diet), daily leafy greens, very limited pellets, carrots as rare treats only

Rats

Common mistake: Seed mixes Reality: Need quality lab blocks supplemented with fresh foods

The Pattern

For almost all small pets: Hay or quality staple food is the foundation. Fresh foods are essential. Treats are rare.

Mistake #4: No Veterinary Care

"It's just a hamster" is no excuse for suffering.

The Problem

• Many owners never take small pets to vets
• Small pets hide illness until it's advanced
• By the time symptoms are obvious, it may be too late

The Reality

Small pets get:

• Respiratory infections
• Dental problems (common in rabbits, guinea pigs)
• Tumors (common in rats, older hamsters)
• Parasites
• GI stasis (rabbits, guinea pigs—can be fatal)

The Fix

• Find an exotic vet BEFORE you need one
• Budget for veterinary care
• Learn warning signs for your species—the Merck Veterinary Manual is a reliable resource for recognizing symptoms in small mammals
• Respond quickly to changes in behavior

Mistake #5: Wrong Social Setup

Some small pets need friends. Others must live alone. Getting this wrong causes fights, stress, or loneliness.

Must Live ALONE

• Syrian hamsters: Will fight to the death with other Syrians
• Chinese hamsters: Usually need to be alone

Can Live in Pairs/Groups (Carefully)

• Dwarf hamsters: Same-sex pairs from the same litter sometimes work; often end up fighting
• Gerbils: Need companions; same-sex pairs or groups
• Rats: Need companions; same-sex pairs or groups (minimum 2)
• Guinea pigs: Social; same-sex pairs or groups
• Rabbits: Social; bonded pairs best (spayed/neutered)

Common Mistakes

• Putting two Syrian hamsters together ("they seemed to like each other at the store")
• Getting a single rat ("I'll give it enough attention")
• Adding a "friend" to an established solo guinea pig without proper introduction

Mistake #6: Inadequate Temperature Control

Small pets are sensitive to temperature extremes.

Temperature Issues

Hamsters: Below 65°F can trigger hibernation (potentially fatal for pets). Above 80°F causes heat stress.

Guinea pigs: Very sensitive to heat. Above 80°F is dangerous. Below 60°F is too cold.

Rabbits: Heat stress is common above 80°F. Can tolerate cold better than heat.

Rats: Prefer 65-80°F. Sensitive to drafts.

Common Mistakes

• Cage in direct sunlight
• Cage near drafts or vents
• Unheated rooms in winter
• No cooling options in summer

Mistake #7: No Mental Enrichment

Bored pets develop health and behavior problems.

What Bored Small Pets Do

• Bar chewing (dental damage)
• Excessive digging
• Aggression
• Depression/lethargy
• Self-harm (over-grooming, biting themselves)

Enrichment Ideas

Hamsters:

• Large wheel (silent spinner type)
• Tunnels and hides
• Scatter feeding instead of bowl feeding
• Deep bedding for burrowing

Guinea pigs:

• Floor time in safe area
• Hideys and tunnels
• Foraging opportunities
• Social interaction with cage mates and humans

Rabbits:

• Large exercise area
• Digging boxes
• Tunnels and platforms
• Chew toys
• Free-roaming time

Rats:

• Out-of-cage playtime daily
• Climbing opportunities
• Puzzle feeders
• Social interaction (with humans and rat companions)

Mistake #8: Improper Handling

Small pets aren't automatically cuddly. Trust takes time.

Common Handling Mistakes

Grabbing from above: Looks like a predator attack. Terrifying.

Picking up when hiding: They're hiding because they don't want interaction.

Squeezing too tight: Especially dangerous for rabbits (fragile spines).

Picking up rabbits by ears: NEVER. This is painful and harmful.

Waking them up: Many small pets are nocturnal. Let them sleep.

Proper Approach

• Move slowly
• Let them come to you
• Scoop from below, not grab from above
• Build trust over days/weeks, not minutes
• Respect their sleep schedule

Mistake #9: Ignoring Species-Specific Needs

Not all small pets are the same. What works for one species may harm another.

Species-Specific Requirements

Rabbits: Need spaying/neutering (females have 80% uterine cancer risk otherwise). Need unlimited hay. Cannot be kept in small cages 24/7.

Guinea pigs: Cannot synthesize vitamin C—must get it from diet daily.

Hamsters: Need deep bedding for burrowing. Need large wheels.

Rats: Need companions. Need vertical climbing space.

Gerbils: Need deep substrate for digging. Need dust baths.

Chinchillas: Cannot get wet. Need dust baths. Extremely sensitive to heat.

Research YOUR specific species thoroughly.

Mistake #10: Expecting Low Maintenance

Small pets are sold as starter pets. They're anything but.

The Reality

• Daily feeding and water
• Daily spot cleaning
• Weekly deep cleaning
• Daily enrichment and interaction
• Ongoing veterinary costs
• Species-appropriate housing (which isn't cheap)
• Lifespan commitment (rabbits live 10+ years!)

The Takeaway

If you're not ready for this commitment, reconsider getting a small pet. They deserve real care, not "starter pet" neglect.

The Bottom Line

Small pets are wonderful companions when cared for properly. But that key phrase—"cared for properly"—is where most people fall short.

Before getting any small pet:

1. Research species-specific needs thoroughly
2. Calculate true costs (proper cage, vet care, quality food)
3. Understand the time commitment
4. Find an exotic vet
5. Set up housing BEFORE bringing the pet home

Your small pet deserves more than a too-small cage and pellet-only diet. Give them the life they deserve.

Related: Best Bedding for Small Animals Related: Guinea Pig Diet Guide

Frequently Asked Questions

What is the single biggest mistake new small pet owners make?

Housing animals in cages that are far too small is the most universal and harmful mistake. Pet stores sell cages designed for shelf display, not animal welfare—most are a fraction of the recommended minimum size. Undersized housing causes stress, obesity, aggression, repetitive behaviors, and a drastically shortened lifespan. Always research minimum cage sizes before purchasing, and choose the largest enclosure you can afford and accommodate.

Do small pets like hamsters and guinea pigs need to see a vet?

Yes, all small pets benefit from annual veterinary checkups, and they require an exotic animal veterinarian rather than a standard dog/cat vet. Small animals are masters at hiding illness—by the time symptoms become obvious, the condition is often advanced. Annual wellness exams can catch issues like dental disease, respiratory problems, and tumors early when they are still treatable.

Is it okay to house guinea pigs and rabbits together?

No, guinea pigs and rabbits should not be housed together despite this being common practice in the past. Rabbits can kick and seriously injure guinea pigs, they carry Bordetella bacteria that is often fatal to guinea pigs, and their dietary needs differ significantly. Guinea pigs need companionship of their own species, and rabbits should be bonded with another rabbit for proper socialization.