Your Dog's First Heat:
Timing, Signs, and How to Manage It
One day our walk friend Choco's family (she's a Poodle) called in a pale-faced panic: blood on the bed, something must be wrong. It was her first heat. I'd only ever raised a male: my dog Gureum (it means "cloud" in Korean): so I studied alongside them: and nearly all of it turned out to be things that wouldn't have scared anyone who knew them in advance. Here's what we learned together.
A first heat typically starts at 6-12 months of age and runs about 3 weeks. Small breeds come early: large breeds can pass 18 months. After that: once or twice a year. The headline signs are bleeding and vulvar swelling: and it is not illness: it's normal sexual maturation. The management core: absolute separation from males during the window, and if there are no breeding plans, a spay-timing conversation with the vet.
When does it come, and what are the signs?
Onset scales with body size: small breeds like Maltese and Poodles at 6-10 months, mid-size at 8-12, large breeds as late as 12-24. The easy mnemonic: it arrives around two-thirds of adult body weight. And the signs precede the blood: the vulva swells beyond normal, she licks the area often, urinates small and frequent, turns edgy or unusually flat. Still, the most common discovery is the classic one: small scattered drops on the bed or floor.
The 3 weeks, stage by stage
| Stage | Length | What changes | Management |
|---|---|---|---|
| Proestrus | ~7-10 days | Bleeding starts, swelling, males rebuffed | Dog diapers on: walk times shifted |
| Estrus | ~5-10 days | Blood lightens: the receptive window | THE fertile window: males blocked entirely |
| Diestrus | ~2 months | Outwardly normal: hormones still running | Watch for false-pregnancy signs |
| Anestrus | Months | Hormonal quiet | The right window for a spay |
※ Counterintuitive and critical: the LIGHTENING of the blood marks the most fertile stretch, not the end of it. Less blood is not the all-clear.
Walks and hygiene during the heat
- Keep walking: shift the clock. Early morning and late night, when few dogs are out. A female in heat broadcasts to males hundreds of meters away.
- Leash short: and the retractable leash sits this window out entirely. This particular accident takes seconds.
- Dog parks, dog cafes, daycare: a 3-week sabbatical.
- Dog diapers at home: removed several times a day to let the skin dry. Worn nonstop, they brew dermatitis.
- Self-cleaning by licking is natural: no need to fight it.
Choco's first heat reportedly came with marathon napping and a sudden need to be held. A few days of edginess or drooping is common: the prescription is simply a quieter, gentler house than usual.
Three weeks where the walk clock IS the strategy
During a heat, many households move walks to early morning and late night. Log walks in kkeung and the dates and times keep themselves: flip through the list and those 3 weeks: when, and how: sit in plain view. Care that runs on a calendar is easier with a calendar that writes itself.
Log today's walk →After the first heat
The spay conversation
With no breeding plans, spaying sharply cuts pyometra and mammary-tumor risk. Many reports put the strongest mammary-tumor prevention at spaying BEFORE the first heat: though growth and breed can shift the calculus. Surgery is avoided mid-heat because of bleeding risk: the usual plan is 2-3 months after the cycle ends, in the hormonal quiet, with the vet setting the date.
Know about false pregnancy
A month or two after a heat, some dogs: never pregnant: develop swollen teats, adopt a plush toy, refuse meals. Hormone-driven false pregnancy. Most cases pass naturally in 2-3 weeks: hot, painful mammary glands are the line where it becomes a clinic visit.
Write the date down
Record the first heat's start date somewhere durable. The next arrives roughly 6-10 months later, and individual dogs run surprisingly regular cycles: one observed cycle buys you a prepared second one. Handy for booking trips and grooming around it, too.
A first heat startles the owner far more than the dog. And then you go through one, and discover it was never an emergency. The full kit: a few pairs of dog diapers, and a little composure. That covers it.
Frequently asked questions
How much bleeding should I expect?
Can I bathe her during the heat?
Without spaying, do heats continue for life?
She's in heat and we have a male dog at home.
No first heat by age two. Problem?
This article is general information and does not replace a veterinary diagnosis. Talk to your vet about your dog's condition.