[Rescued]

I honestly would get a can of compressed air, water gun, even a citronella spray and carry it with you- my guess is that if they did get loose and you sprayed one, they would both run back to the house yelping, giving you enough time to leave with your dogs and then maybe talk to their owners later. IMO a shot of something in their face is much better than the possibility of one getting seriously injured, and with luck you won't have to use it in the first place.

 

[Rescued]

I mean originally my thought was pepper spray... make sure its legal where you live, and honestly if you aim for the ground or air NEAR them, it'll sting enough to scare them off but won't do permanent damage. Again, I'm not advocating macing random dogs, but this is a case where stinging eyes are preferable to the alternative.