Thank you for the additional information.
Sometimes we can see that dogs do have spontaneous GI upsets, somewhat like we could expect from a human. Sometimes they find something interesting to eat in their environment which can cause a GI upset. It won't hurt to treat this is though it's a GI upset until proven otherwise. Below are some directions to help. I have included information for you on nausea/vomiting, as well, because we want to prevent this from happening. Vomiting often accompanies diarrhea, so pepcid should lower the risk so long as it's given regularly.
There are a few things that can be done at home to help make a pet with a stomach upset feel better. 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. This should help to improve the stool and prevent nausea/vomiting in the near future.
Once the stool normalizes, you can then perform a slow switch back over to the regular food. If at any point you see persistent vomiting, bloody vomit or diarrhea, intestinal cramping, rectal tissue protruding, etc. you'll need to have him seen promptly for medical care.
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