Tea tree oil can be very dangerous if licked.
The common heartworm medications do not contain arsenic, but yes they are poison. The treatment is injections of an arsenic derivative. It is given IM deep in the back and is extremely painful. Movement has to be restricted so the dying worms don't cut off oxygen supply, etc. My girl is liver compromised and I still don't let her go without it. To each their own, but in my opinion it is not optional.
Although they aren't as bad in the western US and it may be optional there...
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