That looks nothing like a Rowan from the photosNot Ailanthus (Tree of Heaven, Stinking Sumac, etc...).
They have an even number of leavlets... normally don't have a single 'terminal' leaflet on the leaves. Also the leaflets are "truncate" at the bast (cut off - don't have a nice even taper from wide to the stem). I've seen that referred to as a 'tooth' at the base of the leaf.
Now that's an accurate description.Your dog barfed out moldy peanut butter and peppercorns that fermented in his gut and then dried out on your lawn. It smells distinctive.
Your right bout the leaves ash is out too butter nut huh I'll have to look that one upThat looks nothing like a Rowan from the photos
Agrees on the non-paired terminal leaf in the cluster
What about butter nut?
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Leaves are reminiscent of a Caucasian wingnut ...
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What do you see on the ground? Any fruit / nuts that might help ID?