1. Is this behaviour normal for a neutered bunny? I’ve never had a boy before, but everything I’m reading says they should stop spraying after neutering. And he was supposedly neutered over 6 months ago. Is there a way I can check without seeing a vet? And if this is normal, is there a way to curb the behavior of pooping and spraying everywhere?

It’s not unheard of for a neutered rabbit, especially a young one. They can still spray… but if the urine is really smelly I’d be suspicious about if he is neutered also. One way to check is turn him on his back and check for testicles. I believe they are usually to each side or slighty forward of the genital mound. Rabbits can draw them up so it’s not a 100% foolproof way to check but if you’re seeing them, well then you know he’s intact!
Sometimes with neutered rabbits you can detect a very fine scar where the incision was.

Any chance his former owner can get you his vet records?

The pooping is likely just that it’s all new territory for him. No doubt his senses are on overload with that plus another rabbit being present. How long have you had him?
If he is infact intact, then I would attritbute this mostly to his hormones.

2. When would you recommend putting them in the same cage? I wonder if putting them together would help curb his need to “mark” everything with his scent.

You would need to bond them before they live in the same habitat. This process can take some time but not always. For some pairs it’s very quick, even instant. Because you are seeing a lot chasing, this could escalate to fighting so they are really not ready to be put together to live.
Check out the Binky Bunny info on Bonding if you haven’t already. https://binkybunny.com/BUNNYINFO/BondingInfo/tabid/63/Default.aspx
This is also a useful guide: http://www.rabbitnetwork.org/articles/bond.shtml  
There are lots of other great resources about around so if you’re wanting more info, just ask here and I’m sure the members will be able to point you to some.

Hope this helps.

It’s very important that you don’t just “put them together”. There is a very specific process that must be followed. A typical, “easy” bonding can take about two weeks start to finish. “Difficult” bonds can take several months. Read the info that Jersey posted. Also, this is a great bonding article:

http://www.rabbitnetwork.org/articles/bond.shtml

They are both so beautiful! I love Fozzie’s coloring!

Neutered males can still spray, especially to mark against another bunny. Once they are bonded, it should reduce or stop.

What is your plan for bonding? Do you have a neutral space (many people use a bathtub or bathroom)? Can you supervise their interactions for at least 30 minutes a day (60 minutes would be even better…). Do you have a method to “stress” them if necessary (a washing machine, a car)?

It is used mainly for aggression, but it can be helpful to do it once or twice, because it will usually result in instant snuggling. It’s hard for them to fight when crowded in a small laundry basket atop a moving, noisy washing machine. You might want to give it a try.

At this point, they can still have out of cage playtime individually. But eventually you will want to have their only playtime be in the presence of the other. If they want to play, they HAVE TO BE NICE.

Are you switching them between cages every 24 hours? That is another technique that works well to mix up their scents. Leave the litterbox, the food bowls, hidey houses/toys in place… JUST switch the bunny. (I am assuming they’ve each been vet-checked so there are no parasites or other contraindications to having them in the same space.)

Bonding bunnies IS stressful on the humans, so don’t apologise.

Likely Fozzie thought his chances of getting to her were better in the bath tub. Its a useful place when you first put rabbits together because you can intercede quickly if needed.
Space can effect them very differently and varies rabbit to rabbit. You have to experiment a bit. Some do better in larger areas and some in even smaller areas. One of out fourm leaders used a cube made from NIC grids and had her rabbits in this side by side.

As your 2 have already had interaction in a larger space without aggression, you could probably continue with that, just in a more neutral zone. Try the bathroom floor maybe. You can also create neutral zones by putting a pen on a blanket or tarp. When I did this, i pegged sheets around the pen to make it feel more enclosed.

Since Panda is just escaping Fozzies pursuits and not fighting him (which is great!) you could put a hidey box in the area for her to go to. You will want to help move things along though. So petting them both siide by side, and feeding them in there together are some good ways for them to have positive interactions. Many rabbit Does are territorial when they were in the home first, but from what I can tell, Panda is not. That is a big bonus. : )

Edit to add:  You will really need to confirm if he’s neutered above all else. If he’s not, any efforts you make in bonding now are pretty much pointless. You may be able to call your vet and see if a vet tech can take a look. You mightn’t have to book in or pay for that. Alternatively and rabbit rescue that does things like grooming services? They would be accustomed to people bringing their pet rabbit in.   I’d even want the sex confirmed. The previous owner might have had a girl all this time and not known. It’s not unusual….lol

About him being neutered… or not… the people you got him from, did they say THEY neutered him THEMSELVES (meaning: they made the appointment, they drove him to the vet, they picked him up after, they paid the vet for the neuter.) Or did they get him from someone else who SAID he was neutered? I’ve even heard of petstore employees telling people that 6 or 8 week old bunnies were neutered, when clearly, they were not. Can you find out more info about this?

That being said, neutered males (or females) can and will still hump as a show for dominance.

Typically people who show rabbits do not neuter since the guidelines state that neutering disqualifies them from being shown. I’ve heard, on a rare occasion, of responsible breeders neutering prior to rehoming, but that’s very, very rare. Keep us posted.