Make your own litterbox to obtain urine sample Unwatch Thread Debbie W I modified a 3 part ( 2 solid bottom tube and one slotted for sifting) litter box so I could get urine for glucose and ketones testing. I used rubber cement and glued 5 sewing bobbins to the inside of both solid tubs. One in each corner and 1 in the center. Then glued vinyl window screening to the outside bottom of sifting pan. The sifting part sits on top of the bobbins and creates space for urine collection. I then used Breeze pellets,( safflower seeds also work) in the box. Now the urine goes thru to the bottom pan. I replace the pan containing urine with the other solid modified tub and after taking sample, dump it in the toilet and clean the tub so it's ready for next use. I hope this helps someone because it's been tough trying to get urine until this.