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We as parents like to entertain them, give them what they want, etc. But we have to be prepared to take care of the animal and love it, etc, when the kids are done being excited about it. Think of it this way... I don't like taking care of the cages, I dislike the poo and pee getting on me, or the stuff getting on the floor, it's a pain. The smell sucks. Now I'm an adult and I can force myself to do it regardless of how much I want to. A child is not going to do that, they lose interest and they don't want to take care of a pet for 5+ years.
While I don't recommend a family not get one just because they have kids who will lose interest. I would like to see families that want to adopt as a whole, not just the children. Moms and or dads who don't mind taking care of the pigs and will spend time with them. Compared to other animals these guinea pigs are very easy. You don't have to walk them, buy huge bags of litter, etc. They require daily handling and food, water, hay, vitamin C.
I just wanted to put the idea out there that while other websites say how great of a first pet cavies are, or that they are great for children, yes they are, but be realistic and adopt if YOU want to be responsible for it. Not a child, or anyone under the age of 18(ish).