Small toothed leaf in hay ID

Size? Looks like a burnet to me, probably fodder burnet (Poterium sanguisorba ssp. balearicum) based on the sharp-toothed margin. Alder leaves are serrated to a degree but not toothed.
 
Thanks all, it’s slightly bigger then a two p coin and I walked out to our field hedge with dog rose in it and it matched pretty perfectly
 
According to my plant app it’s great burnet. So ok for horses. Is a bit like hazel though. But I’d check with whoever made and sold the hay.
 
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