Has her urine been sent for a culture and sensitivity? Her strain of infection could be resistent to certain drugs.
Can you get her a dental cleaning? If not giving her real bones to gnaw on will help with tarter. Bones that are considered recreational bones and are not consumable like a big femur bone or marrow bone.
As far as food goes, I’d feed her a regular food. Not a “senior” food or a “dental health” food. There are few “senior” foods I’d recommend like Merrick or Amicus (but Amicus is for small breeds). Some budget friendly foods would be Nutrisource, Dr Tim’s, Fromm, Victor, ProPac and a Tractor Supply brand called 4Health Grain Free or Coscto brand called Kirkland’s. A kibble will break up into bits before doing much scraping on the teeth.
You might also try a d-mannose supplement. It attracts a certain kind of bacteria away from the bladder wall.
Also a fellow pugvillage.com member called 6BeautifulPugs has used Cystex tablets (OTC) with success for her troubled UTI dog. You can contact her if you wish. She’s a foster mom that specializes in the old and infirmed.
http://www.pugvillage.com/forum/pug-life/124181-good-news-ching-once.html
