Phantom Pregnancy in dogs – signs and what to do

Updated 2026-09-30 · 1 sources

Based on: PDSA

Contact a vet today

Contact your vet today if you think your dog has this – it can become serious. A phantom pregnancy is when a dog acts and feels pregnant even though she isn’t.

What to do now

What you can do now

Contact your vet
Note when it started, how often it happens and what else you see
Take a photo or short video to show the vet
Keep fresh water available
Let your dog rest somewhere calm

Don't

Do not give any human medicine
Do not wait if it gets worse

What it is

A phantom pregnancy can develop after a season and cause a dog to act and feel pregnant when she isn’t.^[1] In severe cases, it can include mastitis, a mammary gland infection, and urgent veterinary contact is advised if your dog appears to be in pain or develops a more serious problem.^[1]

Signs

Swollen mammary glands and milk production, or clear-brown liquid
Collecting toys, blankets or clothes
Mothering a soft toy or another item
Nervousness or aggression
Low energy
Reduced appetite
Mastitis or mammary gland infection in severe cases
Swollen tummy in more extreme cases

What the experts say

“Overview. A phantom pregnancy is a condition that can develop after a season, which causes a dog to act and feel pregnant when she isn’t. During a phantom pregnancy, most dogs start nesting, behaving differently, and lactating (producing milk).”
— PDSA [1]

If your pet is struggling to breathe, has collapsed, is having a seizure or can't stand up: go to the nearest vet now.

Not sure how serious it is?

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Common questions

What is a phantom pregnancy?

A phantom pregnancy is a condition that can develop after a season and cause a dog to act and feel pregnant when she isn’t.^[1]

What signs can a dog have?

Signs can include swollen mammary glands and milk production or clear-brown liquid, collecting toys or clothes, mothering an item, nervousness or aggression, low energy, reduced appetite, mastitis in severe cases and a swollen tummy in more extreme cases.^[1]

When should I contact a vet urgently?

Contact your vet urgently if your dog appears to be in pain or develops a more serious problem such as mastitis, a mammary gland infection.^[1]

Sources

PDSA

How this page was made: written with the help of AI from the sources below, then checked claim by claim against those sources. Urgency levels follow OkPaw’s fixed safety rules. It is guidance, not a diagnosis. How we write our pages