False pregnancy in dogs: what breeders should know
She is nesting, her belly looks round and there is milk, yet no puppies are coming. It happens far more often than new breeders expect. This VerifiedStuds guide explains why, how to tell it from the real thing, and when a vet should step in.
A false pregnancy, also called pseudopregnancy or phantom pregnancy, is a set of pregnancy-like changes in a female who is not carrying puppies. It can follow any heat, whether she was bred or not.
The cause is hormonal and entirely normal. After every heat, a female's body produces progesterone for about two months, as if she were pregnant. When that hormone falls, another one called prolactin rises. Prolactin drives milk production and mothering behavior. In some females the effect is strong enough to see.
Physical signs
Behavioral signs
Swollen mammary glands
Nesting and digging in bedding
Milk or clear fluid from the nipples
Mothering toys or other objects
A fuller belly and weight gain
Restlessness or clinginess
Reduced appetite, sometimes vomiting
Guarding a "nest", sometimes with growling
Signs range from barely noticeable to dramatic. A few females even show mock labor, with panting and straining.
Signs usually begin six to twelve weeks after the end of her heat. That is about the time real puppies would be born. Most cases settle without treatment in two to three weeks.
A female who has had one false pregnancy often has another after later heats. However, it does not harm her fertility, and she can still carry a normal litter in future.
From the outside, the two can look the same. Therefore, if she was bred, or might have been, do not guess. A vet can tell quickly.
Relaxin blood test. Relaxin comes only from a placenta, so the test stays negative in a false pregnancy.
Ultrasound. A scan from about day 25 shows whether puppies are present.
X-ray. After about day 45, puppy skeletons would be visible.
See dog pregnancy tests and the signs a dog is pregnant. If you know the mating date, the dog pregnancy calculator shows when each test works.
Do not milk her or massage the glands. Stimulation makes more milk and prolongs the problem.
Stop her licking her nipples. A light T-shirt or a cone can help.
Remove the "puppies" gently if she is fixated on toys, and distract her with walks and games.
Keep her routine normal, with a little extra exercise.
Do not cut food or water sharply without asking your vet first.
Call your vet in any of these cases:
Hot, hard, red or painful glands, which can mean mastitis.
Signs lasting more than three or four weeks.
Vaginal discharge, fever, heavy thirst or dullness. In an unspayed female after a heat, these can point to pyometra, a womb infection that is an emergency.
Marked aggression or distress.
Any chance she is truly pregnant.
For severe cases, vets can prescribe a drug that lowers prolactin. Spaying prevents future episodes, but vets usually wait until the signs have passed before operating.
A false pregnancy after a planned breeding is a disappointment, and it usually comes down to timing. Next season, use hormone tests to find her fertile days. Read progesterone testing for dogs, when to breed a dog in heat and the dog heat cycle guide.
In addition, check your stud agreement for a return service. See the stud fee guide. When you are ready to try again, find a health-tested stud. Stud owners can list their stud free. This page is general information, not veterinary advice.
How long does a false pregnancy last in dogs?
Usually two to three weeks. If signs continue beyond a month, see your vet.
How soon after a heat does false pregnancy start?
Typically six to twelve weeks after the heat ends.
Can a dog have a false pregnancy without mating?
Yes. The hormones follow the same pattern after every heat, so mating is not needed.
How can I tell a false pregnancy from a real one?
You cannot reliably do it by eye. A relaxin blood test or an ultrasound gives a clear answer.
Does false pregnancy mean my dog is infertile?
No. It is a normal hormonal response, and it does not reduce her chances of a real litter later.
Sources: VCA Animal Hospitals, false pregnancy or pseudopregnancy in dogs, VCA Animal Hospitals, pregnancy testing in the dog, Merck Veterinary Manual, pregnancy determination.
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