I thought my dog had one… You have to look for blood in their urine, or a foul smell… When dogs get a urinary tract infections, you will notice they can't hold their pee and they will start to urinate in places they don't usually pee. Such as your bed, or the couch… They can't help it, so don't punish your dog if he or she has been peeing on household furniture. Some dogs might only have one of these symptoms.. One other thing to look for is sensitivity on the area where their bladder is… Give your dog a rub and see if it bothers him/her! Get it checked out right away if your dog has any of these symptoms.
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Attention Ladies, this is Suzi, many people have been writing in asking what the stuff was that I used to clear up my UTI last week, so I wanted to put the link to this stuff here
It is called CT - DM 
same as in humans, frequency, urgency and pain with urination.
References :
RN
I thought my dog had one… You have to look for blood in their urine, or a foul smell… When dogs get a urinary tract infections, you will notice they can't hold their pee and they will start to urinate in places they don't usually pee. Such as your bed, or the couch… They can't help it, so don't punish your dog if he or she has been peeing on household furniture. Some dogs might only have one of these symptoms.. One other thing to look for is sensitivity on the area where their bladder is… Give your dog a rub and see if it bothers him/her! Get it checked out right away if your dog has any of these symptoms.
References :
Dog Urinary Tract Infection: Symptoms and Natural Remedy for UTI in Dogs: Owning a dog is lots of fun and very rew… http://bit.ly/aeN3nC
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http://onlywire.com/r/14039490 Symptoms of dog | dog urinary tract infection: symptoms and natural remedies for dogs of UTI Aicle by at 2
http://onlywire.com/r/14039490 Symptoms of dog | dog urinary tract infection: symptoms and natural remedies for dogs of UTI Aicle by at 2