I have just (9 days ago) rehomed a rescue Jack Russell girl who is 1. The rescue centre said she was tolerant of other dogs.
I didn't take her out for the first couple of days then when I did she was great for the first couple of days - no reaction to dogs just a sniff etc + happily walked with a French bulldog we met.
Then we met up with my dad who has a bouncy but friendly bigger dog. He came bounding up to us and my JRT started snarling, barking and snapping at him.
Since then she has reacted in a similar way to all dogs.
I have been reading Beverly Courtney's growly dog books and have kept her away from other dogs since (on advice from rescue centre + books) but can't keep this up indefinitely. She is very energetic and needs off lead runs for long periods but I worry for the safety of her and other dogs if I take her to places we may meet other dogs. She is the same on and off lead and also reacts if she sees a dog out of the car window etc.
Any advice would be gratefully received - I really want her to be able to enjoy walks without having to drive miles to avoid other dogs!