Urethral Obstruction in Cats
Following discharge from the veterinary hospital, the cat should be placed
on a special diet; which diet depends on the type of crystals found in the
urine. For cats with magnesium phosphate crystals, diets such as Hill’s
Prescription Diet Feline s/d, Eukanuba Low pH/S, Purina UR St/Ox, Royal Canin
Control Formula, Royal Canin Dissolution Formula, and Royal Canin Urinary SO 30
help dissolve any residual struvite crystals or stones in the urinary bladder.
These foods are low in magnesium and aid in maintaining a normal acid urine. In
cats fed these special diets exclusively, signs associated with FLUTD will
normally cease within the first five to seven days. To completely dissolve all
residual struvite crystals or stones, the diet should be followed for one to
two months. These diets, however, are high in salt and ordinarily are not used
as a maintenance food. It is important to feed only the prescribed diet. Do not
feed fish, shellfish, cheese, vitamin-mineral supplements, or table scraps.
These foods contain extra magnesium and also produce an alkaline urine.
During and immediately after the dissolution process, you may be asked to
monitor your cat’s urine pH at home or to bring in a urine specimen to be
checked for struvite crystals under the microscope.
For those plugs or stones that consist of nonstruvite compounds, such as
calcium oxalate, there are also diets that will be of some assistance to
prevent recurrence. These include Eukanuba Moderate pH O, Purina UR St/Ox, and
Royal Canin SO 30.
No matter what type of urolith is present, surgery may be the best option
for your cat, especially if the obstruction cannot be resolved. Your
veterinarian will discuss the options with you.