The problem statement is revealed as follows. It is recommended to collect urine in the morning, in a sterile vessel; however, the procedure of this biological material collection in animals is rather challenging in implementation and requires certain effort and practical skills. The purpose is revealed as follows. Meanwhile, urine collection in dogs is rather important in a veterinarian’s practice. The test of collected urine allows to check the animal’s state of health and to evaluate the obtained results, which is important for research. The methodology is revealed as follows. The research has been done using factual observation and documentation, systemic and morphological analyses. The mathematical model for the technological process has been compiled based on a set theory. The findings (results). A general model for technological process of urine collection has been developed and a description of the model components provided, which allows to view them as a vector of technical support. Originality (novelty). A distinguishing feature of the offered urine collection technological process model is that based on the aggregate of set elements combining processes, means, objects and phenomena of the model, a device has been developed allowing to select optimal sizes depending on the animal breed. The practical value is revealed as follows. The implementation will allow to obtain a convenient comfortable means for urine collection in dogs of different breeds using vessels of different volume.