Joy gets very unsettled and pushes her luck with humans when field mates changed as she tried to work out her place in the herd. It was always harder for her though. Before I bought her she was on working livery, kept in a large herd in a large field but corralled with a smaller varying selection (depending on who was being used for lessons) during the day. It was in the corral that she was bullied, kept from hay and water from the others, but when in the field this was never a problem as she kept out of the way and just binge ate!
When I bought her, she had lots of weight to lose and so needed restricted grazing on a small paddock and in a small herd of 4 continuous companions, sometimes with her and her buddy further restricted as she is an exceptionally good doer and her buddy had a rotated pedal bone through laminate and at exceedingly high risk. In those 8 months she learnt to talk horse and interact as part of a herd and to trust again.
Then I moved yards for the first time. Joy went to being one of only 3. She initially took the mick with me and as a first time owner if only 8 months I felt sorry for her and let her get away with things. This confused her even more and in hindsight I should have continued with the same boundaries and expectations so I could remain her one constant in life, the one thing she could be sure of.
After only 6 weeks, Joy became very attached to her 2 herd members and was thrown into a fizz when they moved to another yard across the lane for more facilities. I had learnt my lesson and continued to have consistent expectations of her and be firm to enforce them. She was unsettled trying to get used to the 2 new herd members that came in, and then again what a 3rd temporary pony came too.
I was lucky enough to get offered to rent the field myself to call the shots. Trouble was, the people owning the 2 herd members then wanted to get a third and bought something totally unsuitable, Shetland stallion which they believed was a gelding! I called the lady with the original 2 I moved on with in that field initially and put Joy back on with them for a week until the liveries left taking all 3 ponies. So I had the choice of putting Joy back on my field and hoping I could find suitable liveries quickly as she'd be kept alone, or I'd met a lady on the yard with more facilities who had a horse very similar to Joy and was on her own and she suggested we share. So that's what I did. It was just Joy and Ami and they were good together. 6 months later, they moved and my friend with the 2 Joy was originally bonded to wanted to share. I'd realised by this time she was a serial yard hopper (in the year id known her she had moved 4 times!) and asked her seriously if she'd be staying as I didn't want Joy mucked about. After only 1 week, she gave a months notice as she wanted to move again! It was then that I was offered Little Un on loan as a companion so Joy wasn't always going through upheaval. Here we are still, 5 years in from that.
I often wish we could be on a yard with a huge fatty paddock with bugger all grass in it and a large herd of all the same needs. It doesn't exist in my area though, believe me, I've been looking!
Joy needs stability and constancy in her life. She doesn't do well on change so I've strived to provide her with a good constant companion and that's helped her, although she and Littles have had to be separated as he now needs more grass than she does, neither minded (although Joy would get grass envy and jump in with him!) but I did so she is now muzzled and there is no need to separate except when shes exercised. I'd have never wanted another pony if it hadn't been for her needs. She'd had survived without a constant companion but I firmly believe with a lesser quality of life.