The increased breathing pattern tells us that she's uncomfortable and likely nauseated. Unfortunately, because she vomited up plastic there's every reason to believe that the potential for a gastric foreign body is present. This would happen if some of the frisbee were to block her intestines partially or fully and could require surgery.
I can give you some things to try at home to help with the nausea and help move the small pieces through, but if she continues to vomit she's going to need to have some additional diagnostics performed at your vet's office to determine the extend of this issue.
The first thing 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 buy the 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.
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