Question: why do rats wee on you

Heather Eyre answered on 24 Jun 2013:

When I’m measuring their blood pressure sometimes the just need to go to the toilet, and seeing as they are sat on my knee they end up weeing on me!

can also happen if I make them jump for any reason.

I forgive them because my rats definitely have personalities of their own and they actually learn too, so it happens less when they realise they are just going to sit on me in a blanket for a little while while I collect some data! I bet babies wee their nappies when they first see a nurse or doctor too!