Pelvic factors causing difficult delivery in female dogs. The female dog has not fully reached sexual maturity age, and the pelvic bone has not developed to a reproductive state; History of pelvic fractures in dogs; Pelvic bone tumor; Pelvic developmental abnormalities, etc. Animal ultrasound can be used to examine the pelvic area of female dogs, and animal X-rays can also be used for pelvic evaluation.

Abdominal factors causing difficult delivery in female dogs. Older female dogs with abdominal wall pain, diaphragm injury, and other factors can cause painful or weak contractions, leading to difficult labor. Use animal B-ultrasound to check for any damage to the diaphragm, and if there is timely treatment or elimination.

Uterine factors causing difficult delivery in female dogs. Congenital developmental abnormalities, uterine fibroids degeneration, and uterine torsion in female dogs can easily lead to difficult childbirth. Many of these diseases can be accurately diagnosed through veterinary ultrasound.

The factor of uterine atony caused by difficult delivery in female dogs. The mother dog carries too few fetuses, which results in insufficient stimulation for the mother's delivery, or excessive uterine dilation due to multiple pregnancies, excessive fetal water, and large total fetal volume; Lack of exercise, excessive obesity detected by animal ultrasound, malnutrition, old age and weakness; Dysregulation of estrogen, progesterone or posterior pituitary hormone secretion, and excessive progesterone; Insufficient calcium and glucose can lead to uterine atony.

Factors affecting the cervix, vagina, and vulva of female dogs during difficult childbirth. Cervical incompetence caused by hormonal imbalance, fibrous tissue hyperplasia or scarring, and congenital dysplasia; Through animal B-ultrasound examination, it was found that the vaginal dilation was incomplete due to congenital dysplasia, fibrous tissue hyperplasia, tumors, cysts, abscesses, and vaginal prolapse; Congenital dysplasia, fibrous tissue hyperplasia and scarring, and premature mating leading to incomplete vaginal dilation are important methods for animal B-ultrasound examination.

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