i do not think its a problem
it is safe but I would not recommend it. It will dry out your hair. You should use shampoo if you can.
Yes, it is perfectly safe to use hair spray on newly died hair! The chemicals in the hair spray will not effect your recently dyed hair.
NO
Oils
I would not use it because it might not come out of your hair.
Talc powder serves as a glidant
yes
Pretty safe, go ahead and use it.
Yes, they say in the commercial that it's safe.
You really shouldn't do that but if you insist on doing it do not use a permanent hair color and be sure to not get the dye on it's skin. I would suggest to make sure your dogs hair is long and use natural dyes.
Use cornstarch, powder foundation, baking soda (makes hair a bit dry though ), plain flour (fave^_^). Do not use baby powder. Baby powder is made of Talc that can cause cancer and asthma. If the baby powder is talc free then you should definetly use it.
That would depend on what powder it is. Flea powder is fine and a good idea. Keep in mind that dogs do have the tendency to lick themselves, and if the powder is toxic it may end up poisoning them.