I need some advice from the cat parents out there.

[MIButterfly]

From time to time, my cat, Holly, pees right up against the wall of the litter box and occasionally, the urine goes outside of the box. Should I get larger litter boxes or covered litter boxes? Which would work better?

Thank you for attention to this matter (sorry, I couldn’t resist. At least I didn't do in all caps!).

Seriously, thank you in advance.

[Twoflower]

1. Had the same problem.

I bought a tall box from Amazon made by IRIS.

[Ocelot II]

2. You could consider a larger box with high sides, or a covered one

if the cat doesn't mind it. My late cat Pixie used to hang her butt outside the box when she peed sometimes, like she didn't really know where her butt was; and getting a large, higher-sided box mostly assured that she'd get all of herself in the box before she let loose.

[Deuxcents]

3. I have a large plastic container that was purposed for storing sweaters, etc.

I have a pretty big kitty..15 pounds so I got the largest one and she can move around in it but it’s not real deep so she gets in n out easily. Also, I don’t have it covered..I don’t think cats like being confined plus it’s a lot easier for me to keep clean with unscented clumping litter. 😸

[marble falls]

4. Taller walled box. Our male sometimes tries to pee into the box from the outside. He takes off at a run after he poops .

... I catch him running I go and bag the poop and any pee balls. He wants his box clean, like after every use. The better I am at keeping up with the box, the less likely he misses the box. A great cat who is the cleanest clean freak I've ever known. He bathes him self continually.

[drmeow]

5. When my cat started missing the box

I got a dog crate pan to put it in: https://www.chewy.com/midwest-lifestages-dog-crate/dp/102280. Even though that cat is gone, I now have two of them - it helps contain the litter somewhat.

A cat that isn't used to a lidded box may not switch easily to one. Taller sides is also good.

[House of Roberts]

6. I use a black concrete mixing tub for a litter pan.

They're available from Home Depot for about $17. The bottom corners have enough curve to be easy to scoop the litter.
I have four cats, so the size helps avoid misses. I don't think a covered box would be big enough for a couple of my cats as they are rather large. Your Holly might be fine with a covered litter box if she's small enough to turn around in it.

[Ziggysmom]

7. Search Chewy or Amazon for stainless steel litter pan with high sides. WAY better than plastic

as the stainless does not hold odors. Mine has one lower side for the cat entry, and we never worry about the accidental tinkle outside the box now.

[dai13sy]

8. I would get a larger box (but not giant) and softer litter to start. A covered box could make her more comfy or

claustrophobic. I've only ever used a large open box and softer litter.

[SuzyandPuffpuff]

9. Lvt retired

I own a cat boarding business. Instead of litter boxes, I use for my boarders AND my own cats...18 gallon or larger Rubbermaid containers and cut a large opening for the cats. They can stand up move around without being cramped and Yu can use a lid or not. I have always felt bigger and taller is better. Especially for sprayers.

[Bayard]

10. I vote with the large deep storage tub group

We're down to one indoor cat now, but I've never had a cat with a problem jumping in/out of one.

[Cloudhopper]

11. I had a cat with that problem, too. We ended up using a Tote

box, without the lid, and cut a hole starting about 5 inches from the bottom. It worked great for us... and them.

[HeartsCanHope]

12. We used a large clear plastic storage box, cut an entrance, and put the litter pan in that. Vet's suggestion.

The plastic storage box was too flimsy and bulky to clean and empty by itself, and was easy to clean when they missed. Put a small amount of litter at the back and front to catch mistakes. Vet said some cats hate covered litter boxes and it can compound the problem. Some cats also like to see what's going on around them when they use the litter box. This worked for all of our cats. Good luck!

[Nigrum Cattus]

13. Here are 2 ideas

https://www.drelseys.com/products/ultra-litter/
https://www.tuftandpaw.com/collections/all/products/cove-litter-box-full

[cksmithy]

14. We have had at least 20 kitties over our

50+ years of marriage. We have used different strategies depending on the cat. We have used a big heavy, sturdy grey storage tubs, (with out the lids) if the cat was able to jump into the storage tub. We have also turned a bathroom bathtub, plugging the drain, tarps lining the tub and duct taped into place, so it wouldn't mess up our plumbing. Both systems have worked for cats who missed the litter box. Their age, health and if they were born feral can affect their litter box usage. All of our cats were rescues, thank goodness for clumping litter. We now have one 16 year cat (feral) who uses her automatic litter maid cat box, with no problem. Her sister, who passed 2 years ago, wouldn't go near it. Both rescued from the gutter, just barely able to crawl, eyes barely opened. Daily cleaning of their box helps, because they don't want to step on their poop or pee to go potty. Good luck.