1. That is a very broad statement, considering the hundreds of species covered by 'tarantula'. A B. smithi is very much different from a P. regalis. Surprisingly little study has been done in this area, so anecdotal evidence is quite important here.I read that tarantula venom is more potent for dogs and cats than it is for people.
2. Some extensive research shows no recorded case of any species or breed of Canid dying from any Brachypelma sp. bite...ever.