On the assumption that the OP is interested in solo wildcamping in the UK, posts about the hazards posed by bears and wolves are not particularly helpful as they are almost as rare in the wild on these shores as GMC Suburbans!
Even in North America, the number of human fatalities caused by bears and wolves is surprisingly small - 2018 seems to have been particularly bad year with (according to Wikipedia so probably worth checking) four fatalities (one a backpacker) caused by all species of bears across the whole of North America with two per year being about the average.
https://en.m.wikipedia.org/wiki/List_of_fatal_bear_attacks_in_North_America
The same source suggests that there have been four fatalities caused by wolves since WW2.
https://en.m.wikipedia.org/wiki/List_of_wolf_attacks_in_North_America
For the sake of completeness, according to Wiki 2018 has been a bad year for mountain lion attacks with two fatalities but they were the first since 2010.
https://en.m.wikipedia.org/wiki/List_of_fatal_cougar_attacks_in_North_America
To put that into context, you are about as likely to die under the hooves of a grumpy cow while out walking in the UK countryside as you are meeting a Revenant style sticky end doing the same in the US of A or Canada.
https://www.independent.co.uk/envir...d-dangerous-britains-killer-cows-1776775.html
It is great to hear from people with different perspectives but IMHO far too many threads on the forum where people are genuinely seeking advice or assistance get derailed and are rendered pointless because some of the more enthusiastic overseas contributors feel the need to chip in and make the thread all about them and their interests.
If you have bears, wolves and cougars in your back yard or nearby, I for one would love to see some photos added to the various wildlife threads on here but just chipping in with “our wildlife (or indeed 4x4 etc), is bigger and badder than yours” posts on threads looking for practical guidance for the sake of it, doesn’t help the OP and puts other people off contributing useful stuff.
Right, rant over and back to the OP’s query - wild camping is a tricky issue (and a bit of an oxymoron) for this forum since in most of the UK, you should get the owners permission before camping on their land.
That said, wild camping is permitted on Dartmoor;
https://getoutside.ordnancesurvey.co.uk/guides/wild-camping-on-dartmoor/
and is accepted on HM Govts own website as being OK above the fence line in the Lake District.
http://www.lakedistrict.gov.uk/visiting/where-to-stay/wild-camping
IME, I would be far more worried by two legged creatures than anything else. If you are camping somewhere without the landowners permission then if strange lights on the hillside or in woods are spotted, you may find someone coming to investigate equipped to deal with poachers, livestock rustlers or thieves. In less remote areas, the little bit of paradise you have selected for the night may also be the local dogging site or party zone for the local chav element.
Well away from the road on Dartmoor or above the fence line in the Lakes and you will be fine but limited tree cover in either or check out the Nearly Wild Camping group on Facebook which provides links to landowners happy to have “wild(ish)” campers on their land and may permit fires and might be the best way to dip a toe in the water.
https://www.facebook.com/NearlyWildCamping/
If you know that humans are not going to be a problem and understand that any wildlife will be more scared of you than the other way around, you should be able to relax and enjoy yourself trying to identify the various nocturnal noises - the sound of loved up foxes is pretty bloodcurdling and angry hedgehogs can be very scary until you know what they are.
Good luck and have fun and make sure to post a trip report of your first solo night out!