Tag Archives: uterus

Why should I desex my dog?

There are many advantages to having your dog desexed.

Desexing prevents the conception of puppies and eliminates the sexual urge.

We remove the ovaries and uterus in the female and the testes in males.   Dogs and bitches are usually desexed at 6 months of age although some are done earlier.

The hormone testosterone takes about a month to decline after castration.  Once it is out of the system desexed male dogs are less likely to wander and have no interest in bitches on heat.  Because they escape or wander less they are less likely to get run over, get involved in fights or lift their legs on every post.

A testis that has not descended into the scrotum has a higher risk of developing a cancer and should be removed as early as possible.

Heat periods or seasons in bitches occur about twice a year and last 3 weeks each time.

Bitches on heat often surprise their owners with their determined attempts to escape and find a mate.

Desexed bitches do not come on heat and cannot conceive puppies.

Desexing also prevents pyometron, an overwhelming infection of the uterus that makes older bitches very ill. Removal of the uterus is the best treatment for pyometron but general anaesthesia for the surgery is a big risk in an old, already sick bitch.

Desexing reduces the risk of breast cancer.

The desexing of females is least complicated when they are not on heat, pregnant or overweight. We recommend desexing bitches at 6 months of age before they come on heat and while the uterus is still immature.

Desexing is done under general anaesthesia. Dogs must be in good health and fasted for twelve hours prior to surgery. General anaesthesia always carries a slight risk but with modern anaesthetic agents, this risk is minimal.  A vet examines all dogs on admission to hospital and before sedation. Discuss any worries with the vet and let us know if your dog is not in peak health.

We do the surgery during the morning and keep your dog in hospital under observation for the afternoon.  A discharge time is arranged on admission.  A vet or veterinary nurse will discuss aftercare with you at discharge.

Once desexed and over the surgery a dog’s metabolism slows down.  Cut the total amount of food fed per day by 30% and make sure you continue with normal exercise routines.

 

Pyometra or infections of the uterus

What is pyometra?

Pyometra is an accumulation of pus in the uterus. Toxic products form and make the bitch very sick.

How do I know if my dog has pyometra?

If the cervix is open pus drains from the vagina and can be seen on the skin or hair under the tail or on bedding and furniture.

If the cervix is closed, the trapped pus distends the uterus and abdomen. The bacteria in the pus release toxins into the circulation.  The dog goes off her food, vomits or passes diarrhoea, drinks a lot of water and becomes very depressed.

How is it treated?

Pyometra is an emergency. Surgery to remove the uterus and ovaries ensures complete recovery. If not treated toxins cause organ damage. If the cervix is closed the uterus may rupture and spill into the abdominal cavity. Either of these is rapidly fatal.  Intravenous fluids and antibiotics before and after surgery reverse the toxicity and control residual infection.

When does it occur?

Pyometra is most common in older bitches after many years of oestrus cycles without pregnancy.  Occasionally younger bitches are affected.

Pyometra occurs about 1-2 months after oestrus.

How is it diagnosed?

A non-desexed female dog that is very ill , drinking a lot of water, and has a vaginal discharge or an enlarged abdomen could have pyometra. They also have a high white blood cell count and serum globulin level. Toxins reduce the ability of the kidneys to concentrate the urine.

An ultrasound examination identifies an enlarged uterus and differentiates pyometra from pregnancy.

Why does my dog have pyometra?

Hormonal changes cause pyometra. After a bitch is on heat or in season (oestrus), progesterone levels stay high for 8-10 weeks, thickening the lining of the uterus in preparation for pregnancy. If pregnancy does not occur for several oestrus cycles, the lining continues to thicken and cysts form in it. The thickened, cystic lining secretes fluid creating an ideal environment for bacterial growth. High progesterone levels also inhibit contraction of uterine muscles preventing expulsion of the fluid.

Drugs containing progesterone and/or oestrogen also predispose bitches to pyometra.

How do bacteria get into the uterus?

The cervix is the gateway to the uterus. It remains tightly closed except during oestrus. When the cervix is open during oestrus vaginal bacteria can enter the uterus easily. If the uterus is normal, bacteria won’t survive.  However, when the uterine wall is thickened and weak, conditions are perfect for bacterial growth.