Dogs there big so you can be a bit ruff with em and vis versa take em for walks *very helpfully for the unfit lol* and protect against intruders probably my fave
Cats well I don't think cats are pets. They're squatters is exactly how i feel ive had a lot of cats the good ones are great probably even better then dogs but the bad ones heck there horrable and if your lucky they'll just leave lol lol worst thing is when they pee on some thing UGHH god help us all !!
Birds can be really nice cleaning there cages can be a pain in the ass but a well trained bird can be a really good pet i use to have a really nice one Sadly for the 2 good ones ive had there have been 14 others that were total sh*ts
Fish are relaxing once again cleaning can be a pain Specially with the bigger tanks but like birds they die fast you only get 2-5 years out of a fish *depending on type* and thats if you take dam good care of them things like fin rot will kill a fish like that and it really dosent take much to get it... not a bad pet but a tad boring.
ive heard a lot about ferrets and i know some people whove had em id LOVE to get one sadly there banned where i live
And regarless of species *in most cases* a trained pet is worth 100 times more then an un trained pet and like some one else has alredy said self traing gets dam boring after youve done it a few times