We all know that obstructed labor is a dangerous thing for both humans and animals. Difficult labor in dogs refers to the difficulties that occur during the delivery of the mother dog, which cannot produce the fetus smoothly, and is one of the multiple diseases during labor. The manifestations of obstructed labor in dogs: usually the following phenomena indicate that obstructed labor may occur, and artificial assistance should be prepared in time. 1. abnormal fetal position or fetal potential, for example, only one leg enters the vagina. 2. strong effort for 20-30 min, but no fetal expulsion is seen; delivery is weak, sporadic, and lasts for 2-3 h. 3. after the previous fetal expulsion, no further delivery is seen for 4 h (unless delivery is completed). If the interval between fetal deliveries is prolonged, it suggests the possibility of obstructed labor, but no firm conclusion can be drawn. This is because in normal births, a fetus is delivered every 10 to 15 minutes, whereas in dogs that are weak or whose uterine contractions are irregular, it may take several hours to deliver a fetus. The causes of obstructed labor in dogs are generally caused by fetal and maternal factors, and the corresponding artificial assistance should be performed in time. 1. Abnormal fetal position, i.e., improper fetal position, horizontal, vertical, oblique, inferior, lateral, abnormal fetal position and blockage of the birth canal caused by obstructed labor. Response: Firstly, correct the fetal position by lifting the two hind limbs of the female dog, injecting paraffin oil or soybean oil 3-5mL into the vagina of the female dog, inserting the vagina with the right hand after sterilization, and pushing the fetus into the pelvic cavity with the left hand outside the abdominal wall, then correct the fetal position. If there are other fetuses in the body, first push back the fetus behind the improper position to free up the position for correction of fetal position. For transverse, vertical, inferior, lateral, and head-front positions, the inner and outer hands cooperate well to squeeze and push in one direction. After the fetal position is corrected, the index finger of the right hand is inserted into the vagina for examination. If the uterine cervix is fully open, the fetal membrane is not broken and the pelvis is normal, the fetal extrusion method can be applied, that is, use a wide, wet hot towel wrapped tightly around the abdomen from the transverse septum and pelvis direction, squeeze the fetus while the bitch’s uterus is contracting, pull the head or rump of the fetus outward with the right index finger, and the assistant pick the bitch’s pubic door to pull the fetus out with the help of grease lubrication. 2. Fetal development abnormalities can easily cause obstructed labor, such as huge fetuses and deformed fetuses, and stillbirths can also easily cause obstructed labor in female dogs. The first step is to make a lateral incision of 2 to 3 cm above the pubic valve to enlarge the caliber of the birth canal. When the fetus is close to the puerperium, the operator uses the right hand to peel back the labia and dilate to both sides. The assistant massages the uterus through the abdominal wall to promote regular contractions, and presses on the abdomen to increase abdominal pressure during uterine contractions. When the fetus exposes the pubic door, the operator pulls the fetus out by tugging on it with the left hand. For stillbirths and deformed fetuses, fetal fragmentation should be performed to destroy the fetus and reduce its size to make delivery less difficult. The operator’s right index finger is inserted into the vagina to determine the position of the fetus, and the assistant works with the operator outside the abdominal wall to fix the fetus’ neck, then the operator’s index finger is withdrawn from the vagina, and a small hook with a diamond shape is sent into the vagina with the right index finger. At this time, the assistant fixes the fetal neck outside the abdominal wall, and the operator withdraws the right index finger 1~2 cm and hooks the fetal jaws with force, and then pulls out the fetal jaws with force after the index finger checks to make sure the hook is real. According to the above method, pull out the skull, neck and forelimbs of the fetus in turn, and finally pull out the fetal pelvis. If there are more stillborn fetuses, after pulling out all the stillborn fetuses according to the above method, in order to prevent septic uteritis and systemic infection, use 500 ml of saline, 120,000 units of gentamicin and 1.6 million units of penicillin for vaginal cleaning. The abnormal labor force is dominated by uterine contractions throughout the labor process, supplemented by contractions of the diaphragm, abdominal muscles and abdominal wall muscles and contractions of the anal levator. If the birth canal and fetal factors are normal, the uterine contractions play a decisive role in the expansion of the cervical opening and the descent of the fetal head first. Normal uterine contractions are rhythmic, symmetrical, and have a corresponding intensity and frequency. If the uterine contraction loses rhythm, symmetry, frequency and intensity, the contraction will be weak or too strong, and the contraction will be uncoordinated, resulting in obstructed labor in the bitch. Insufficient labor force, insufficient abdominal pressure and weak uterine contractions. The first abdominal massage, oil lubrication in the birth canal, followed by the application of oxytocin 5 to 10 units to enhance the uterine contraction, and again with the right index finger inserted into the birth canal, touch the head of the fetus, traction delivery during the contraction of the uterus. 2. abnormal birth canal obstruction, incomplete dilatation of the cervix, vagina and pubic door, and insufficient expansion of the pelvis cause obstructed labor. The bony birth canal includes birth canal, pelvis and soft birth canal (lower uterine segment, cervix, vagina) Any birth canal abnormality can cause obstructed labor, but clinically the bony birth canal abnormality is more common. The obstructed labor is caused by narrowing of the birth canal, incomplete dilatation of the cervix, vagina and vagina, and inadequate dilatation of the pelvis, mostly because the delivery period has not yet arrived. Although the bitch has signs of labor, the cervical opening is not fully opened, the boundary between the cervix and vagina is not disappeared, and the pelvis is not fully opened. In this case, as long as the fetal position is normal, wait patiently. In this case, as long as the fetal position is normal, we should wait patiently. Every 30 minutes, we should check the finger to determine the degree of opening of the cervix and pelvis. 3. Secondly, the use of oxytocin in excess causes uterine paralysis. In the above cases, the use of oxytocin should be stopped immediately, followed by massage and hot compresses on the abdominal wall to promote blood circulation and restore the uterus to normal. When the uterus is in normal contraction, finger examination should be performed to determine the cause of obstructed labor and artificially assisted labor should be used to deliver the fetus. The principles of artificially assisted labor for difficult female dogs are “clear diagnosis, lubrication first, pushing later, correcting fetal position, lending labor strength and slow pulling”. Therefore, according to the specific situation of each dog, take appropriate measures, as long as the method is proper, artificially assisted delivery will be successful. Note that in order to prevent dog obstructed labor, when the dog pregnancy, must pay attention to the dog to supplement adequate and reasonable nutrition, but if the nutrition is too good, in the time of birth also easy to cause the fetus because of too large, the situation of obstructed labor, so in the supplemental nutrition, but also pay attention to let the mother dog have reasonable exercise, in this case, can strengthen the mother dog’s body, in the time of birth, can be more smooth.
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