What are the symptoms of urinary tract infection in dogs?

The symptoms of urinary tract infection in dogs include: frequent urination (but difficulty urinating), pain and discomfort during urination, and linear and bottom-like discharge of urine. Urine is turbid, mixed with pus and blood in severe cases, and sometimes shed mucous membranes are excluded. The affected dog is sensitive when palpated, and it is difficult to insert a urinary catheter during probing. The affected dog shows pain and uneasiness, and generally the systemic symptoms are not obvious.