Sonic,
Annoying as it undoubtedly is, keep you head down while you're new to the job - don't give anybody an excuse to put you "on the list"
Make sure you ring the RSPCA from home as well.
i'd usually agree but everyone actually encouraged me to do it!
Which is usually a sign they'd like to kick up a stink but are scared of the consequences, so glad to find some other pillock to do it for them
the general consensus in the office is that it is cruel and if she moans this week, we'll call the RSPCA.
If you genuinely believe the dog's suffering you should either confront her and ask her to stop or if that's not going to work or she doesn't listen then ring the RSPCA anyway. It should depend on the dog's welfare not whether she's annoying you.