The ultrasonographic characteristics and the involution of the uterus were described in 15 pregnant bitches by serial B-mode (real time) technique at period of 0 to 28 days postpartum. The uterine diameter decreased progressively, without influence of parity or litter size. The ultrasonographic image of the uterus is better view in the first week and the image quality is poor at subsequent weeks. The uterus was composed of only three ecographic layers.
Bitch; ultrasonography; uterine involution
