Recently, I moved my wonderful little thirteen year-old mare up to a new property. She adjusted wonderfully, so that isn't any sort of issue, but the fact that I'm getting there so frequently -- and taking her out for very long rides -- seems to be seriously wearing her down. Willow (tons of pictures of her in previous threads, if you'd like to see her) went from a somewhat hot and very "go"-oriented horse to one that is suddenly lagging behind on each and every ride. We've upped her feed from just hay and pasture (adding beat-pulp and grain to the mix as well), but it hasn't seemed to make much of a difference. I'm very much about making all my rides positive for both me and my girl, but I'm worried that she may grow to dislike them if I'm pushing her too hard or if she's not looking forwards to going. She's been there for three weeks now, and I'm considering possibly adding some oats or something of that sort to try and give her some more energy.
For the record, I've been trying to space my rides out a wee more since I've noticed the change in demeanor. I gave her four days off this week but, again, it seemed to do little for her level of motivation. We go pretty easy, too (walk/trot mostly, though it's rugged terrain), but -- again -- it just seems to really be wearing her down. I'm worried.
Could it be her age? Should I add something to her feed and see if it livens her up at all, or look at a different solution entirely? Her fitness has gone up for sure; will she perhaps get more energy the fitter she gets?
Thanks everyone! All opinions are appreciated; I want to make sure my girl is content!