persuading

Hey everyone! Hope you had a great weekend! I'm new on the forum and th main reason I signed up was because of this issue. Recently one of my boars, Ollie, died I know this was because my Guinea pigs are housed outdoors in a huge hutch which was great when we got it in the summer months...

How can I persuade my dad to let me get some rats? I am asking this as there are 5 rats at my work that keep having babies and the pet store can't do anything with them so they will go for snake food or just chucked out (once killed) so I really want to save them. I am not saying the pet store...