NONE! (what an obserd Q)
No, dumbo rats are much bigger than fancy rats. They are both very nice creatures though.
This is a blue fancy rat: http://www.freewebs.com/rattyloving/Anyaonrocks.jpg
This is a blue fancy rat: http://www.freewebs.com/rattyloving/Anyaonrocks.jpg
No rat is really "the nicest". it all depends on how much you play with them and toys in their cage. If you are looking to buy one, my personnal favorite is the fancy rat.
No
the ones that i know about are the guinee rat(newly discovered species), musk rat, black rat, the brown rat, dwarf rat, and the fancy rat
Rattus norvegicus
the rat will be weak/ its eyes will be clouded/ it may refuse to eat or drink/it may not move much. if this is happening to your rat take them to the vet.
I've Seen A Lot Of Pictures Of Carrots In Fancy Rat Cages.
fancy mice
It depends on the pet store. They may if they sell both Dumbo, fancy and standard rats. They will likely put it in with the standard rats. This means it will likely be sold as a feeder.
If they begin to feel pain and realize they have been poisoned, they may try to drink water and regurgitate in order to rinse out their stomach. Sadly, most rat poison is painful and effective and this does not help much. Rat poison does not need water to be activated, nor does access to water increase a rat's chances of survival if it has eaten much of it.