When I replaced my 1970 Peugeot (which came with a frame pump between built-in holders that I used for all pumping purposes, home and away) with a 1997 trek, I wanted to get an after-market frame pump to add to my Trek, so I made pioneering used of the ancient internet usenet to find one that was recommended. I was shocked that what returned was relatively few postings about pumps but hundreds of postings about how to deal with vicious dog attacks out on the road. Many anecdotes about whacking Dobermans and Pit Bulls across the snout with a fine frame pump, which seemed to be the preferred weapon of choice, much less bulky than firearms, mace, or other countermeasures.
So I say, get a nice menacing frame pump. The one I got was held under the top tube by tenson between the down tube and seat tube. I never had to use it. But that's why the NFA (National Framepump Association) recommends everyone carry a framepump. If the bad dogs know your armed, they'll stay away.