Reddit mentions of Winco 4-Inch Pan, Full

Pain management is critical if he's in pain. You can work with your vet to find the right medicine and it could make a world of difference in his quality of life.

I got these steps for my senior cat and they were great. With them, he was able to get onto my bed (his favorite spot.) Later, I did have to attach plexiglass to the sides when he got really wobbly and stumbled over the sides. At the very end of his life, I removed my bed frame and box spring so he just had to navigate up onto the mattress.

Amazon and pet stores do sell low-sided litter boxes; they really do help arthritic cats. Another option is to use a lower sided baking/steamer pan. They're metal so they don't absorb smells and are easy to clean. If things get messy, keep the box on a shower curtain liner ($2) and towels to minimize damage and ease clean-up.

Raising the food and water dishes was a good move. I couldn't find a tray that was the right size so I cut and taped a cardboard box to the height where my cat could walk up and eat without bending. For water, I used tall drinking glasses that, when filled, were also at an easily-accessible height.

If it makes you feel any better, my cat also avoided heating pads and I tried two different ones!

Bathing him with warm wet washcloths is great. Old kitties, especially those with arthritis, can really benefit from the extra help.

The last thing I'll suggest is having key things (litter, food, water) nearby so your cat isn't forced to travel across the house to them. Limit him from areas of the house or stairs, if needed, with a cheap baby gate.

Good luck. I know it's hard.