Vomiting/retching
Violent twitching
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Should your dog appear to have any of the above, straight to the vets without delay and ALSO, very importantly bring any of the poison with you to the vets so it can be examined and then the correct form of treatment can be administered.
Do not induce vomiting if you suspect that that barbiturates, kerosene or any corrosive has been swallowed, or if the dog is convulsing. I would add that recent poison laid down around the Ruislip area would be considered as corrosive (anti-freeze). If you suspect any illness to your dog, play safe and straight to the vets.
