Yes, boys can get UTI's. My husband had one when he was a child.
My daughter also had one when she was only 3 months. Her breathing was 120 breaths per minute when it should've only been in the 30/40's. Her doctor told us to take her to the hospital right away. They ran several tests and finally tested her urine and found out she had a double bladder infection meaning she had two different types of bacteria to be treated. She spent four days in the hospital to make sure her breathing was going down and it did. But, we also ended up going to a Lung Doctor because her breathing still remained slightly higher than it should've been. She eventually outgrew the fast breathing...It was all very scary. I'm sure your son's body wouldn't respond to it like this...she was very tiny.
When she was older, they also did a simple test to make sure her bladder was emptying like it should and not backing up into her kidney's. Everything was fine.
However, anytime she complains when she goes potty, I call the doctor and get her in ASAP since she already had one at a very young age. She used to be catherized when they thought she had one...that is a cleaner urine catch but very painful to watch them go through. Now that she is older she can go potty in a cup with no problems. :)
I'd rather take her and have her give a urine sample and be told it's negative than not take her and she actually have an infection that can be treated with an antibiotic.
I would feel very bad if she ended up in pain and I didn't do anything about it.
My son is now 18 months and a few months ago he cried when he went potty. I called the doctor and they said to bring him in (because you never know). We tried to take a urine sample using a bag that goes over the pee-pee area. But, he wouldn't go. So, they gave me a cup and told me I could try to get it from home. Before his bath when he would always potty I held the cup up and got the urine sample with no trouble. I took it in to the doctor and it was negative.
Again, I would rather be safe than sorry.
I've had plenty of UTI's in the past. Some REALLY burn and others I've caught before the burning started. But, either way, they ARE NOT FUN!!!!
If I were you I would take him in just to be safe. :)
I hope he feels better soon!