My cat sniffs new litter box but won't use it. What should I do?

I love that you have already switched to the unscented litter as that can be a big problem for many cats. Putting the litter box in the shower is a great idea. I would also make sure to clean up the spots he went outside the litterbox using an enzymatic pet stain cleaner to ensure he does not keep smelling urine/feces there and think that it is akin to a litterbox. Other things, like cleaning the litter box often, having multiple litterboxes which are different types of boxes, and trying different types of litter (such as fine-grain litter) may also help you figure out what type of litter Mittens likes. While it certainly sounds like Mittens is having trouble getting used to his new litterbox, it is important to remember that internal diseases (like organ, hormonal, or orthopedic diseases, among other possible causes) can cause Mittens to have a hard time making it into the litterbox so it is important to take Mittens to your vet for evaluation to make sure we are not missing something else that is making it hard for Mittens to make it to the litterbox. I have attached a link to an article with more great suggestions below. Good luck! https://www.petcoach.co/article/how-to-train-your-cat-to-use-a-litter-box/

He may not like the type of litter you are using. In all the studies done on cats they have found that most prefer plain old sand as opposed to any type of cat litter. My suggestion would be to put a few boxes out in various locations in the house and put a different type/style of litter in each one to see which one he likes best. Remember that most cats don't like to use the box if it is in a noisy, high-traffic area so put at least one box somewhere quiet. Being that he is so young/small still the sides of the box may be too high for him to comfortably get in/out of the box so try to find some with lower sides or make one with lower sides yourself. You can use shallow foil baking pans, tupperware containers, etc. Finally, you can make one box covered. Some cats preferred a covered box. Cats are usually very easy to litter train so if none of the above works then you should get him to your vet for an exam. He may have a urinary tract infection or some other issue that is making him not want to use the box. Hope this helps. Best wishes.

Just use the same litter. Take Fatboy and gently place him in the box and take one of the front paws and and scratcch the litter a bit. That should be enough, Cats are pretty clever and he is probably happy about the new box.

It can be stressful for cats to move into a new home. There are a few simple things you can do to help them litter train in your house. First, have at least 1 litter box per cat plus one; therefore, if you just have the two kittens, I would recommend 3 litter boxes. Second, make sure the litter box is large. The kittens will keep growing, and if it becomes too small, they won't use it. Third, some cats don't like covered litter boxes and some like them. You can try to boxes covered and uncovered, and see what they like best. I would recommend using the same litter that was used at their old home because they are used to the smell and texture. Make sure their litter boxes aren't close to their food and water, cats don't like to use the bathroom near their food source. While you are litter training them in your house, don't let them have free rein of the house when you are gone. Place them in a small room with their litter boxes while you are away from the house, and provide them with water and a place to sleep at the opposite end of the room from the boxes. Make sure you clean the litter box daily. If they continue to have problems going to the bathroom outside the litter box, it may be a health issue, and I'd recommend bringing them into your vet for a health check.

Provide a litterbox or two for them. Use litterbox attractants to get them to investigate the box. If they go elsewhere, you can use a tissue to soak up the urine or pick up the stool and place them in the litterbox. Monitor the kittens for cues they are going to go. This can include circling, pacing, lifting the tail or sniffing about. Place them in the box immediately. Be patient and be consistent. Use an enzymatic cleaner such as Nature's Miracle to thoroughly clean soiled areas.

I am sorry to hear about your frustrations with your kitties! It could definitely be the change in litterboxes. Many cats are finicky about their bathroom behavior and changes may upset them. I would consider taking the top off the new box temporarily until they become used to it, and once they are using it regularly you can add the top. Some cats may never be comfortable with a covered litterbox, but hopefully with time they will become used to it. Also be sure you haven't changed the litter type at the same time as changes in litter type can also upset them. You can also try taking some soiled litter from a used litterbox to provide some scent that may encourage them to use the new box.

It may take him some time to become acclimated to the new litter. You can try adding a litterbox attractant to get him back into the box. An example of one such product can be found by clicking the link below. https://www.petco.com/shop/en/petcostore/product/precious-cat-dr-elseys-ultra-litter-attractant