It's very possible that the defecation on the carpet may have been the first sign of a GI upset and that the vomiting and shivering are secondary symptoms. It's common for dogs to shiver when they do not feel well or are uncomfortable.
I can give you some steps to take at home to try to calm his stomach, thus calming the vomiting, and a diet to try to help move the diaper particles through his GI tract. If these steps do not help, however, he absolutely needs to be seen by your vet tomorrow, especially if the vomiting persists. Diapers and other absorbent products used by humans commonly do cause gastric blockages when consumed by dogs. It would be ideal to err on the side of caution here. Thus far, nothing in what you've shared as far as history makes me think that Dozer is in a critical condition, just that he does not feel well. If he worsens overnight, do not hesitate to visit the ER in your area.
The first step is to administer a dose of regular pepcid (famotidine) every 12-24 hours. You will want to give 0.5mg/pound of body weight (a 10# ***** would receive 5mg, a 5# ***** would receive 2.5mg, etc). For this, you can visit any human pharmacy and buy the OTC brand name Pepcid, or you can use the cheaper, off-brand “famotidine” that’s available. Either will be useful.
2 hours following a dose of famotidine, the time needed for the medication to begin working, you can offer a bland diet. To make this, you’ll combine white or brown rice, boneless, skinless chicken breast and sufficient water for cooking in a stock pot. Boil on medium until it turns to mush and the breast is easily flaked. To avoid more nausea, start with small amounts to begin with and offer the amount every 2-4 hours. A few teaspoons to start is typically sufficient and you can work your way up every 2-4 hours in incremental increases until you’re sure no vomiting will be seen. If your companion requires a more palatable food, try adding in pureed baby food in chicken, turkey and similar flavors. Avoid those that contain onion or garlic in the ingredient panel.
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