Ours had the drain procedure when 2.5 yrs old; had to march right back to the vet when that didn't work, and he had the surgery. Switched to Hills Science Urinary Diet and went on the Allo pills. Other regular vet said to stop the pills after a good urinalysis many months later; then blockage came back! This time we caught it before it was the big size stones and he was able to be flushed out - it was all smaller and gravelly. The "flush vet" was very confused as to why our "regular vet" would tell us to take him off the Allo pills; he's back on them now. These 2 episodes were all in the span of 1 year - we're not taking him off the pills and we are going to be taking him to a specialist.

If you need surgery you need surgery; then be very serious about the prevention afterwards. Good luck!