The steps of studying the fetal age of a female dog by veterinary B-ultrasound must first be fixed: with the assistance of the dog owner, the dog should lie on its back (if the dog does not cooperate, it can also lie on its side). Hair clipping: the second nipple from the bottom is the center, from the posterior edge of the rib arch to the last pair of nipples. Exploration: Apply coupling agent evenly, adjust the frequency of the veterinary B-ultrasound probe to 3.5 MHz or 5MHz, and make the veterinary B-ultrasound probe longitudinally cut the skin with the second nipple as the center, and move linearly for exploration.

Veterinary B-ultrasound

The diagnosis basis of the gestational age of a female dog by veterinary B-ultrasound is that the three data of fetal head length, eyeball diameter, and spine length have good linear distribution, which can be used as the diagnosis basis of gestational age in theory. However, the measurement difficulty and measurement error of the first two items are large, so they should not be used. The spine length can be used as the diagnosis basis of gestational age of 40-60d. The linear distribution of the diameter of the gestational sac of a female dog measured by veterinary B-ultrasound is only good before 40d, which can be used as the diagnosis basis of 20-40d pregnancy.

Positive diagnosis of pregnancy and diagnosis of fetal number on veterinary B-ultrasound 20 days after mating, a gestational sac can be detected, which is an irregular round dark area with a double-layer membrane structure on the edge. It can be used as a basis for positive diagnosis of pregnancy. At this time, the gestational sac is not easy to be found on veterinary B-ultrasound examination, and cannot be used as a basis for judging the number of fetuses. After 30 days, the gestational sac on veterinary B-ultrasound is easy to find and can be used as a basis for judging the number of fetuses.

link: https://www.bxlimage.com/nw/284.html