Liz Buchanan BVSc MRCVS
Hello. As well as an infection - which may be rarer than most people think - your vet might have looked at the specific gravity of urine, which reflects a dogs' ability to concentrate their own urine and can highlight kidney problems, liver disease, diabetes, etc, abd consider pyometra (uterus infection) and so on. If the specific gravity is normal, it might be that they are simply drinking more in hot weather as a means of keeping cool, but this is also rarer than people think and water restriction is not something I would tend to reccommend if that is the case - perhaps cooling of the environment might be preferable. Another concern is whether the patient experiences pain eg arthritis and doesn't want to physically get up and pee - sore joints is something that we tend to associate with winter months, but various factors can skew this eg if they tend to exercise more in the summer. There may be hormonal factors - I would have to chat to an expert about this, but ovaries arent the only source of hormonal variation in the female body and it could be that scent marking in the Spring is her habit. Furthermore, there can be behavioural factors - what changes in the summer? Is there some reason that it may be favourable NOT to go outside? - eg people walking past the house more frequently etc. I hope that something there proves to be useful - as ever, if your vet suggests something that doesn't solve the problem, always return to them, ask what it could still be and what could be done to rule it out. We would love to hear how you get on!