urinate
Male dogs frequently piddle everywhere.
I didn't see him piddle on the beige carpet until it was too late.
When he piddles on the mattress we only have to wash the cover.

SMART Vocabulary: related words and phrases

Animal physiology: urine & urinating
accident
bathroom
bodily function
cock a leg
excrete
excretion
go to the bathroomidiom
leak
pass
pass wateridiom
pee
piddle
piss
slash
take a leak/have a leakidiom
tinkle
water
wazz
wee
wet your pantsidiom