Slight bubbly urine? ..

  So my mom has been noticing that our cat sometimes has foam/bubbles in his pee that goes away or is around the puddle. But it's not really permanent nor a lot, and I haven't seen it before in his litterbox, only outside. So is this a warning sign or is he fine? He drinks water well, and pees regularly outside and inside. He doesn't seem ill or has trouble peeing either.

Hello - I'm afraid that if cats' urine is bubbly, I would be concerned that protein is getting into the urine.  This could be the result of a urine infection, but could also be the case that protein is passing from the blood into the urine via the kidneys, so may suggest kidney damage.  We would therefore suggest a visit to the vets sooner rather than later - and if you can catch some fresh urine that morning (eg by leaving the litter out of the cat box and pouring a sample into a clean dry container), that will help your vet - don't worry if you don't see bubbles in that particular sample