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Hi, i`m Richard, a Veterinarian from the UK. Hopefully I can help today.
The dose your dog has received is roughly 3x the max recommended normal dose. If this dose was given over a prolonged period, it could result in changes associated with the heart, however as a one-off dose it should be perfectly safe.
The signs to look out for would be lack of appetite, nausea, lethargy, diarrhea and generalized weakness. If you are seeing these signs for a prolonged period, I would be keen to have your dog checekd over by your vet.
You are very welcome, the dose should not be toxic, however we commonly see some signs of vomiting but this should be transient.