Hi
@RoyalDuke its great you would be interested in doing your dissertation on guinea pigs but I see you are in the UK and as you probably know there are many ethical approval hurdles to overcome before any study on furry animals, or indeed even questionnaires for humans who care for small furries, can be conducted! Please tell us what university you are based at, what your degree programme is, and whether you plan to conduct a laboratory study or a survey of pet owners, and who is responsible for supervising your dissertation research.
I supervise many zoology dissertation students myself, but I personally would discourage them from trying to study pets as there are so many ethical issues and so many confounding variables!