I really like those areas where the vegetation is filling the areas, else the background surface does not really match with the far distance bushes, it has too much contrast, sharpness.
In my opinion, the wolf blends quite good with the other objects, it is not 100% photorealistic, but I like it.
I know, that blending objects with each other and with the surface is a tough job (guess why you do not see many renders from me with objects
) Maybe adding another population with the grass for the background - smaller, higher object spacing, less saturated colours, would do the job.
,-) Volker