diff --git a/requests_toolbelt/utils/dump.py b/requests_toolbelt/utils/dump.py
index 23b35e75..4a8e71cc 100644
--- a/requests_toolbelt/utils/dump.py
+++ b/requests_toolbelt/utils/dump.py
@@ -104,7 +104,10 @@ def _dump_response_data(response, prefixes, bytearr):
 
     bytearr.extend(prefix + b'\r\n')
 
-    bytearr.extend(response.content)
+    if not response._content_consumed or response._content is False:
+        bytearr.extend(b'<< Response body is being streamed >>')
+    else:
+        bytearr.extend(response.content)
 
 
 def _coerce_to_bytes(data):