Managing Canine Pseudopregnancy: A Stepwise Treatment Approach

Treatment should be guided by the severity of clinical signs. Since pseudopregnancy is a physiologic phenomenon in the bitch, not every case requires medical intervention. The goal is to reduce clinical signs while avoiding treatments that may worsen the hormonal imbalance^1,2. 

1. When "Watchful Waiting" Is Enough 

Many cases of pseudopregnancy resolve spontaneously within 1–3 weeks without treatment. If signs are mild and the bitch is otherwise healthy, veterinarians can reassure owners and recommend monitoring while discouraging maternal behaviors such as nesting and mothering toys². 

2. Conservative Management: Often Overlooked but Effective 

Before reaching for medications, simple management strategies can significantly reduce prolactin-driven lactation and maternal behavior. 

Recommended measures include: 

• Preventing mammary gland stimulation

• Avoiding milking of the glands

• Discouraging licking of the mammary area

• Using an Elizabethan collar when necessary

• Removing toys or objects being treated as puppies

• Increasing exercise and environmental enrichment

Water restriction overnight for 5–7 nights has also been described as a method to reduce milk production by promoting fluid conservation mechanisms, although it should be implemented judiciously and with appropriate clinical oversight². 

For dogs exhibiting significant anxiety, restlessness, or maternal behavior, mild tranquilization with non-phenothiazine drugs may be considered. Phenothiazines are generally avoided because they can stimulate prolactin secretion and potentially worsen the condition². 

3. Medical Therapy: Cabergoline Leads the Way 

When conservative measures fail or lactation is persistent, medical treatment becomes appropriate. 

Historically, a variety of hormonal therapies—including estrogens, progestogens, and androgens—have been used. However, their use has declined because of inconsistent efficacy and significant adverse effects such as pyometra, diabetes mellitus, cystic endometrial hyperplasia, virilization, and bone marrow suppression². 

Today, cabergoline remains the treatment of choice for most overt pseudopregnancy cases. 

As a dopamine agonist, cabergoline suppresses prolactin release from the pituitary gland, directly targeting the hormonal driver of pseudopregnancy. It is typically administered at 5 µg/kg orally once daily for 5–10 days and is associated with fewer adverse effects than older therapies². 

Other prolactin inhibitors that have been used include: 

• Bromocriptine (10–100 µg/kg/day orally for 10–14 days), although vomiting, anorexia, and depression are common adverse effects.

• Metergoline (0.2 mg/kg/day orally for 8–10 days), which may cause anxiety, hyperexcitability, and vocalization².

Clinical improvement should generally be evident within the first week of treatment if pseudopregnancy is the correct diagnosis¹. 

4. The Surgical Option: Prevention, Not Treatment 

For owners who do not intend to breed their dogs, ovariohysterectomy remains the only permanent method of preventing future pseudopregnancy episodes². 

However, timing is critical. 

Veterinarians should avoid performing ovariohysterectomy during overt pseudopregnancy or active diestrus because the sudden withdrawal of progesterone can trigger a prolactin surge, potentially worsening or prolonging clinical signs¹. 

The preferred approach is to first resolve the pseudopregnancy medically and then schedule elective surgery once hormonal activity has normalized¹. 

Practical Clinical Takeaway 

A simple treatment algorithm can help guide decision-making: 

• Mild signs → Monitor and manage conservatively 

• Persistent lactation or significant behavioral changes → Cabergoline therapy 

• Recurrent episodes in non-breeding bitches → Elective ovariohysterectomy after clinical resolution 

References 

1. Root AL, Parkin TD, Hutchison P, Warnes C, Yam PS. Canine pseudopregnancy: an evaluation of prevalence and current treatment protocols in the UK. BMC veterinary research. 2018 May 24;14(1):170. https://link.springer.com/content/pdf/10.1186/s12917-018-1493-1.pdf  

2. Singh LK, Bhimte A, Pipelu W, Mishra GK, Patra MK. Canine pseudopregnancy and its treatment strategies. depression. 2018;17(19):20. https://www.researchgate.net/profile/Laishram-Singh/publication/325646239