I suppose your sister is following this blog then? You could let her read this. Or just give her the links in this post.
Dear Anons sister,
hedgehogs are great pets. They are, however, not for everyone. Some pets look very cute but aren’t suitable for every person. A hedgehog might be great for you, but it could be a huge let down as well.
As with all pets you need to be prepared. If you decide to go on and get a hedgehog, which is something neither your sister nor I can really stop you from, you should do your research first. A pet is a living creature and not a toy. Never buy a hedgehog without doing research. I highly encourage you to read my FAQ as well as this free e-book; the book has everything a new owner needs to know. It is a must read for every hedgehog owner.
Take a look at Hedgehog Central Forums. There is a lot of information on there as well, and a lot of owners you can talk to. There is a very useful thread on there about behaviour expectations.
Your sister is rightfully concerned. A hedgehog (or any other pet) isn’t something you should think lightly about.
* hedgehogs take up a lot of your time
* it can take months before they warm up to you (with daily handling)
* they need a heated environment to live in and require more specialized care
* they are nocturnal so you won’t see your hedgehog at all unless you wake him up
And since hedgehogs are prey animals and easily scared (and stressed), it is not very wise to keep them in a household with animals who like hunting small prey. Even though they have quills a dog can still hurt a hedgehog. WARNING VERY GRAPHIC IMAGES!! dog bite and another. A dog can kill a hedgehog.
There are a lot of people who are following this blog and enjoying my hedgehogs. For a lot of them my hedgehogs would be more fun than actually owning a real one. Not everyone has the patience to bond with a hedgehog, or the time to take care of one. People who go on this blog see cute hedgehogs. Not the poopy wheels, dirty cages, money I spend on them or the hours of bonding before I can actually pet them without them putting up their quills etc.
I can not stop you from buying a hedgehog. I can only try to give you some advice and ask you to please, please do your research and think about this twice. Don’t buy a hedgehog just because they look cute.