Every autumn, rats and mice move from fields and gardens into Cloverdale homes, garages and sheds. For pets this creates three separate risks: contact with the rodents themselves, exposure to whatever is put down to control them, and secondary poisoning from eating a rodent that has already been affected. All three need different responses.
Why they come in, and why now
Rodent behaviour in the Fraser Valley follows the weather closely. Through the summer, food is everywhere and shelter barely matters. From mid-September the temperature drops at night, the rain sets in, fields are cut, and the easy outdoor food disappears within a few weeks.
At the same time, this year’s litters have matured and the population is at its annual peak. Large numbers of young rodents need somewhere to overwinter, and a Cloverdale garage with a gap under the door, a warm crawlspace, or a shed with a bag of birdseed in it is an excellent option.
A mouse fits through a gap the width of a pencil. A rat needs only a little more. Most homes have several such gaps around pipework, vents, door thresholds and the junction between the foundation and the wall.
The first risk: contact with the rodent itself
Cats hunt them and dogs sometimes catch them. That contact carries a few genuine concerns.
- Bite wounds. A cornered rat bites hard. Puncture wounds on the face, paws or muzzle seal over quickly and trap bacteria, which is how abscesses form three or four days later.
- Leptospirosis. Rodents pass this bacterial infection in their urine, and dogs pick it up from contaminated water, damp ground or direct contact. Autumn damp keeps it viable for far longer than summer does.
- Intestinal parasites. Cats that eat rodents can acquire parasites that outdoor cats otherwise avoid, which is worth raising at your next appointment.
- Fleas and mites travelling in on the rodent and moving to your pet.
Any bite or scratch from a rodent is worth a same-day call, even a small one, and particularly on a cat.
The second risk: what gets put down to control them
This is the risk we see the most, and it is the one owners have the most control over.
Rodent bait is designed to be attractive and palatable, which is exactly why dogs eat it. Most products work by interfering with blood clotting, and the crucial feature is the delay. A dog can eat bait and appear completely normal for three to five days before any sign appears, at which point internal bleeding is already underway.
That delay is why waiting to see what happens is the wrong response. Signs, when they come, may include:
- Lethargy, weakness or reluctance to move
- Pale gums
- Coughing, or breathing that seems faster or more laboured
- Bleeding from the nose or gums, or blood in urine or stool
- Bruising under the skin, or swelling around a joint
- A distended or painful abdomen
Not every product works this way. Some affect the brain and cause tremors and seizures within hours, and some cause kidney failure. They look similar in the packet and they are managed completely differently, which is why the single most useful thing you can do is keep the packaging and bring it with you.
If you know or suspect your pet has found bait, phone our urgent care team immediately, whatever the hour and however well your pet seems.
The third risk: eating an affected rodent
Secondary poisoning is real but frequently misunderstood. A cat or dog that catches and eats a rodent which has consumed bait takes in far less than it would by eating the bait directly, so a single mouse is often, though not always, less serious.
The problem in practice is repetition. An affected rodent is slow and easy to catch, so a hunting cat is more likely to catch those than healthy ones, and may do so repeatedly over several weeks. That is where it accumulates.
This is worth knowing if you have a keen hunter and if neighbours are baiting, because you may never see the bait yourself. If your cat is bringing home more rodents than usual this autumn, or bringing home ones that were unusually easy to catch, mention it to us.
Safer ways to keep rodents out
The aim is to make the house unattractive and inaccessible rather than to poison your way out of the problem.
- Seal the entry points. Steel wool and sealant around pipe entries, brush strips under doors, mesh over vents. This is the permanent fix and everything else is temporary.
- Store food in sealed containers. Pet food, birdseed and grass seed in metal or thick plastic bins, never in the original paper bag in a garage.
- Do not leave pet food down overnight, indoors or out.
- Clean under bird feeders or pause them for the autumn. Spilled seed is a reliable draw.
- Clear windfall fruit and keep compost sealed.
- Tidy the garage and shed. Cardboard, insulation and stored fabric make ideal nesting material.
- Move woodpiles away from the house and off the ground where possible.
If you do need to control them
Use enclosed, tamper-resistant bait stations only, place them where no pet can reach, and keep a record of what you used and where. Traps set inside a box that only a rodent can enter are a reasonable alternative in a household with pets. Ask neighbours whether they are baiting, because your dog walks past their garden too.
Whatever you use, keep the packaging for as long as the product is in place. It is the difference between a fast, targeted response and a slow, cautious one.
What happens if your pet is brought in
The first questions will be what, when and how much, which is why the packaging and the timing matter so much. If your pet has arrived quickly, the priority is preventing absorption. If more time has passed, or the timing is unknown, we move to assessment and monitoring.
Our pet diagnostics let us check clotting function and organ values, establish a baseline and repeat it over the following days. That repeat testing is central, because the delayed pattern means a single normal result on day one does not settle the question.
Autumn brings several outdoor hazards to Cloverdale gardens at once. Our guide to wild mushrooms in Cloverdale lawns and parks covers another that appears in exactly the same weeks.
Frequently asked questions
My dog ate rat bait but seems totally fine. Can I wait and see?
No, please phone now. The most common products cause no visible sign for three to five days, by which point internal bleeding has already started. A pet that seems fine is the expected picture in the early stage, not a reason for reassurance. Bring the packaging.
My cat caught a mouse. Should I be worried about poisoning?
One mouse is usually a lower risk than eating bait directly, but it is not zero, and repeated catches over a season add up. Watch for lethargy, pale gums or any bleeding, and call us if you see them. If you know a neighbour is baiting, tell us, because that changes how closely we want to follow it.
Are the pet-safe rodent baits actually safe?
Products marketed that way still need to be lethal to a rodent, so treat the label with caution rather than confidence. The safety usually comes from the station design rather than from the contents. Enclosed stations placed out of reach are the meaningful safeguard.
How long after exposure should I keep watching?
Longer than most people expect. Depending on the product it can be a week or more, and we will give you a specific window. Do not stop watching because a few days have passed without incident, and come back for repeat testing if we have arranged it.
Can I use traps instead? Are those safer around pets?
Generally yes, provided they are inside a box or tunnel that a pet cannot get a paw or nose into. An unprotected snap trap can cause a painful injury to a curious dog or cat. Glue traps are best avoided entirely, both for animal welfare reasons and because a stuck pet is a difficult problem.
My dog rolled on a dead rat but did not eat it. Does that matter?
Usually not from a poisoning point of view, since the risk comes from ingestion. Wash your dog with gloves on and watch for anything unusual. If there is any chance they chewed or swallowed part of it, or if they have any wound where contact occurred, phone us.
Speak to the team at Apollo Animal Hospital
If your pet has found rodent bait or is catching rodents this autumn, phone us and bring the packaging.
Published by the team at Apollo Animal Hospital.
This article is for general educational purposes only and is not a substitute for an in-person veterinary examination or advice about your individual pet. If you have an urgent concern about your pet, contact Apollo Animal Hospital or your nearest emergency veterinary hospital right away.
Apollo Animal Hospital
17525 56 Ave, Surrey, BC V3S 1C4
Phone: (604) 372-4411
Email: apohospital@gmail.com
Hours: Everyday 8:00 AM to 10:00 PM