A pony that does not have the privilege of free access to the toilet, resting in a stall. However, it seems that the pony is quite happy with his conditions, it is quite possible that he voluntarily refused here, in this position.

It is difficult to assign the correct diaper condition tag to this image, because it looks clean on the original version. After the upsale, the diaper looks somewhat unclear, it can be called just like that (clean), or wet, or messy (full), the original request did not contain tags related to the use of a diaper. However, you are free to evaluate for yourself how much this pony used a diaper.
If anyone is interested, I can provide the original version in low resolution.

Prompt: MLP feral white pony, wearing white (rubber diaper), diaper cover, farm, stall, ponyplay, harness, (bridle), white (rubber diaper), white body, white fur, yellow mane, yellow hair, yellow tail, tail, wrapped tail, raised tail, hooves, (wearing diaper), (harness gag, bit gag), (by hioshiru)
Negative: boring_e621_fluffyrock_v4, deformityv6, easynegative, bad-hands-5, bad anatomy, low quality, signature, logo, watermark, short legs, baby, latex suit, rubber suit, boots, socks
Size: 768x640 Sampler Steps: 20 CFG Scale: 8.50 Denoising Strength: 0.75 Model: indigoFurryMix_v120Hybrid Seed: -896106164

Upscale:
Size: 1536x1280 Sampler Steps: 15 CFG Scale: 8.50 Denoising Strength: 0.45 Seed: -1276511821