Undescended testicles (cryptorchidism) is observed when one or both testicles are not present in the scrotum after 4 months of age.

Unexplained weight gain is specifically characterized by the occurrence of weight gain in spite of a reduction in calories and appetite.

Anisocoria is the term for unequal pupil size in dogs. One pupil is normal, while the other is either constricted or dilated. Anisocoria is common in dogs experiencing Horner’s syndrome, but it also results from a variety of conditions and injuries that either affect one eye directly or the parts of the nervous system that control pupil size.

Urinary incontinence in dogs is when urination occurs without control or awareness. This presents as spotting or dribbling of urine, without the pet actively choosing to do so. Conditions which interfere with structures controlling urination, such as the spinal cord, brain, and urogenital system can lead to urinary incontinence.