The most important things to know are the following:
1) The dewormer very well could be causing the vomiting and diarrhea.
2) The vaccines aren't likely to do much good for him since we try to avoid vaccinating a puppy that shows any signs of being unwell.
3) It's very difficult to know if he's having any reaction to the vaccine or just the dewormer because of the timeline with him being vaccinated while feeling ill.
4) Pitbulls are at higher risk for problems because the tend to have weaker immune systems. This goes for many bully breed dogs, unfortunately.
At his age, we must also be worried about parvo, distemper, corona virus, etc. causing the symptoms that you're seeing. There are so many factors playing in here (age, symptoms, dewormer, vaccines) that it's nearly impossible to determine what is the biggest factor.
Fortunately, 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. 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 this does not result in the improvements you’re wanting, it may be necessary to have your companion examined by a veterinarian and injectable medications for nausea administered. I’m particularly a big fan of Cerenia for vomiting as it tends to work quickly, does a great job and works for a full 24 hours. As well, if the symptoms persist, diagnostics like blood work, a fecal exam, parvo test, etc. will be necessary. Once his stool is normalized, you an slowly switch him back over to the food that he will eat. Make sure at 6 weeks of age that you're either offering him soften puppy chow or canned food.
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