The adverse effects of Clavamox tend to be harsher than amoxicillin alone, but in most cases pets are not at risk of any complications unless they are hypersensitive to penicillin (the drug is a penicillin antibiotic) or other β-lactam antibiotics such as cephalexin. We recommend that owners avoid giving this drug to a pregnant dog and be extra cautious when treating dogs with kidney or heart disease, or those who are dehydrated.
FDA Status: It is approved by the FDA for veterinary use both in the form of tablets and liquid drops under application numbers 055-099 and 055-101 respectively.
When my girl had a uti our vet perscribed Cephalexin I believe
Sometimes when an infection simply cannot seem to be cleared up, the reason is a vaginal stricture. A vaginal stricture is a small narrowing in the vagina, creating a ledge for bacteria to colonize. If a female dog's UTI seems stubborn against antibiotics that the culture indicates should be effective, a vaginal exam may be warranted. A stricture can generally be broken down by the veterinarian's finger though some dogs find this painful and sedation may be needed.
What Are the Symptoms of a Dog Bladder Infection? - Vetstreet
It's also possible that the vet is reluctant to do the testing. For example, my dog, Rebel, has a genetic kidney defect that leaves him prone to recurrent UTIs. When I moved to a small town in western Sonoma County years ago and started trying out the local vets, more than a few were very surprised that I wanted a urine culture done, and even actively discouraged me from doing it. Some of them continued to dismiss the idea, regardless of the fact that I was willing and able to pay for the tests -- and in fact was asking for them. Once I had to bluntly tell the veterinarian, "It's my money and it's my dog. I want the test," before she would order it. She had simply reached for the antibiotics the minute the words "bladder infection" were out of my mouth.
7 Antibiotics Often Used To Treat Infections In Dogs