I agree, it does sound dangerous.
I've never heard it suggested to give a rattlesnake vaccine... I think it somewhat is a risk-based decision. What are the chances of your cat not only seeing a rattlesnake but getting bitten?
As to FIV and FeLV (Feline Leukemia Virus), these are viruses that are contracted by blood and saliva in bite wounds etc. So you would choose to give them to indoor/outdoor cats as they could get into fights with neighborhood cats that might carry the diseases. But an indoor only cat that is on a leash any time it sets food outdoors is not going to be in that kind of contact with strange cats. Or it shouldn't be.
I've never heard it suggested to give a rattlesnake vaccine... I think it somewhat is a risk-based decision. What are the chances of your cat not only seeing a rattlesnake but getting bitten?
As to FIV and FeLV (Feline Leukemia Virus), these are viruses that are contracted by blood and saliva in bite wounds etc. So you would choose to give them to indoor/outdoor cats as they could get into fights with neighborhood cats that might carry the diseases. But an indoor only cat that is on a leash any time it sets food outdoors is not going to be in that kind of contact with strange cats. Or it shouldn't be.