Petrie had sucessfully mastered peeing in the litterbox for quite some time now (still haven't gotten all the poops in there, but we were gtting there...).  About 2 days ago he starting peeing right outside the box (not like he was in teh box and missing, but sitting outside and going).  I thought maybe the box needed changing even though it wasn't very filled, so I changed the litter.  He still continued to do it.  He has also peed on me two times now, once lat night and once earlier today, when I have him in my lap petting him.  He hasn't peed on me before.

Pee has ranged from clearish yellow to milky white.  He is eatting and drinking normally, but is being a bit rowdier than normal, with more cage banging and even bit me today.  I did an internet search and saw that this might be a sign of a bladder infection.  Does it sound like it?  Or is he just being a bad bun?  He got fixed about 2.5/3 weeks ago, so I don't think it is spraying.  Can it wait until Monday to get him to the vet or should I take him to the emergency vet?

Is he showing any other signs of being ill? 

I'm not sure, but if he was only fixed a few weeks ago I think it takes up to 4 weeks for the hormones to clear their system, so maybe there is still a chance it's hormonal?  Maybe it's part of the settling process for him.

If you think he might be sick though, you should probably consult with a vet just to be safe.  Like the old saying goes "better safe than sorry", I feel it's very true.

Good luck, please let us know how it turns out.

I've heard that sometimes during the neuter, the vet may accidently release more hormones into his system than normal, while removing the testicles! So that may explain why he has a surge in behaviour. But like Anitastark said, if you think he is in danger, definately take him to a vet. Good luck!

i dont know if this helps but Lollo's behaviour got worse after his neuter for a few weeks, he started spraying when he hadnt before and he was very grumpy- more than usual.it took about 4 weeks for it to really calm down. although he still has no idea how to pee in his litter box, prefering his bed instead- bizzarely he sleeps in the litterbox with wood shavings in and pees in the straw!

Milky white urine can be a sign of too much calcium.  Does it get sludgy?  Long term, this can cause stones, which can be very serious.   Some rabbits are more prone to it, and are just sensitive to calcium, while some diets can cause this - like too much of a particular green - like Kale.

As long as he is eating, drinking normally, and the amount of pee and poo is normal, and he doesn't seem like he is in pain,(hunching near box, and/OR grinding teeth), then that is good, but I would still tell the vet what is going on and let the vet determine if your bunny should be seen right away.

Keep us updated.