Misha not pooping

Hi ,took Misha to the vet ,i noticed he had not been pooping ,she said there was poo in his colon and he will go when he wants to ,he got his revenge on me for taking him to the vet ,he weed in his carrier when it was on the back seat of my car

If you're not feeding him wet food, start feeding him that twice a day and mix in a little bit of plain canned pureed pumpkin or squash baby food. 

I disagree with your vet, however.  Many times when kitties are impacted, they just don't "go when they're ready".  There could be a medical reason why he's not going. 

Hi ,i think Misha has chosen not to use the litter boxes and goes outside to poop ,there are 4 litter trays 3 with fullers earth type litter and 1 with wood pellets ,once during the week he seemed eager to get outside he didn't even have anything to eat .

Hi ,Misha has just had a poo in the litter box ,it is raining here so i didn't let the cats out ,so he had no choice .