Poisoning is always a possibility, although so are many other things. If your dogs are contained in a fenced yard, and if they are kept current on vaccinations, and if they both had the same symptoms followed by death, it does sound suspicious. However, there are things dogs can get into (toxic mushrooms, spoiled food) that are not intentional toxins as well. Also, if you have a wooded area, check it very carefully. Sometimes dogs unearth toxic things that have been buried for a long time. Pesticides can still be toxic after a long time, and many of these can cause symptoms similar to what you noticed. Antifreeze can also cause vomiting, but oftentimes there are other signs too (neurologic, coma, etc. There are just so many things out there. Do you have a good relationship with your neighbors? Sometimes people do throw harmful things over the fence, esp. if your dogs tend to bark a lot. Don't be too quick to be suspicious, but do be careful if you get another pet. Best of luck...
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Dr. Diane K, DVM
