Cat has been straining in litter box for months now. Was on doxycyclene antibiotics never helped. No pain, never lost her appetite, in pretty good spirits from day one. She never eats wet food. Had her on Merrick no grain dry food, now on Purina dry food for uti and I am also giving her vitamin c. Sometimes she has a good urination but for the most part either very little or nothing comes out. Tried homeopathic products, helped temporarily but never cured it. Can't seem to cure this. I need help. Vets just push antibiotics which I have stopped since they were doing more harm then good. Am I better off with the no grain food or should I keep her on the purina UTI food? Giving her 250mg of vitamin c a day, is that enough or should it be less or more? Any help would be appreciated? Have water bowls all over the apt. to lure her to drink more, sometimes she drinks more then others.