
I would ask them to xray the dog to check for bladder stones. My rescue WSD was having trouble weeing one Sunday morning last October- stop start tiny dribbles and kept needing to go out to try again - and as I was booked in to take one of the other dogs for his boosters I took him with me too and asked them to check him over thinking he had a urine infection.
He was xrayed and had huge bladder stones that were causing a blockage and needed emergency surgery straight away or I would have lost him. He had 16 stones and one was the size of a walnut - absolutely huge. The others were of varying sizes but most were the size of peas. It was a big operation and he then had to have a further emergency operation just two days later as the muscle gave way and the stitches just opened up like a zip - luckily I was at the vets at the time. I had noticed a tiny opening in the stitches and had taken him back as a precaution. As we were sitting in the waiting room I saw some blood on the floor underneath him and as he moved the whole wound opened up - around 8"- and the muscle and fatty layer started to literally pour out of the wound. I had to hold it all in with my hands whilst the vets rushed out of the 2 surgeries to help him. They couldn't put back anything that had been exposed due to risk of infection and it was touch and go for a while as to whether he would survive. Really, really scary and I dread to think what would have happened if I hadn't been at the surgery at the time.
The stones were sent off for analysis and luckily were of a type caused by a previous untreated infection - he was a farm dog who had spent his short life on a chain and didn't have a great diet. He is having monthly urine checks for 3 months and so far all is well and the stones aren't expected to return.
If a small stone - gravel size or smaller - manages to travel into the tiny tubes and causes a blockage there is every chance a dog won't survive. I would definitely urge them to have an xray to be on the safe side. It happened so quickly and didn't seem that urgent at first - but became a life and death situation very, very quickly.