There are probably several reasons, for example, people having different skin and different blood types.
Yes,dogs are like people some can react to something and others be totally unaffected.
why do some people have to develop their psychic abilities and others dont people who have to develop them just have to connect more with their subconscience instead of analyzing everything
coffin
some dont trust it others a dummies
dont be silly
From what I've read, it's a combination of two factors: some people smell and taste better to the fleas than others. Secondly some people do not have sensitivity to the bites and therefore don't react and have no idea they've been bitten while others are sensitive and have the allergic reaction that leads to itching.
Black Death was spread by fleas and rats. People working closer to them caught it more.
Some people do get hokked easly and others dont ... it depends on you
some people think phones are good but others dont
Well, its just like how some people like some kinds of food and others dont. Its the same with dogs.
Many people believe that feeding their animals a garlic supplement will kill fleas.
Some people dont do it, others copy other people, and some just get it done or ask the teacher about it. It really depends on the issue. Like if your lazy then some people wont do it. If you have to much to do then some people will copy others. All in all either to solve your problems just do the work or dont. Your life your choice, choose wisely. :P