Our dog is 17 month old and will not cross bridges, she becomes some what
Cartoon in nature when we start to go over one all four legs become rock solid
And she starts to walk backwards, if we do get her on the bridge she commando crawls
Till we get to the other side. She is not afraid of heights because she climbs
On to the shed roof for a snooze in the sun. Has any one else had this problem?   

Is it bridges, steps, or particular surfaces that she has a problem with.

Until you can correctly identify precisely WHAT the particular issue is, you cannot attempt to action it.

No its just bridges, the one in the park is  arched across moving water, the on the woodland walk is across a stream and the one across the motorway and the one at the local suppermarket that crosses the car park all evoke the same response .I not going over that! 

Sounds like a "space" issue then.IE the air underneat the surface.

Perhaps you could get around it by finding something low and wide with a good surface (not a solid block etc )for the dog to get on and have his meals every day. Once he was happy with that you could not feed him except on bridges, therefore building a good association with them, first at the beginning of the bridge, then moving gradually over until traversing the bridge got him his dinner

Just a thought.

Does it make any difference if you have her on a short lead, close to your side, with you walking next to the rails so that she cannot see the drop so well? I have run across this problem before, and it can be sorted with infinite patience. Have a hungry dog, very special treats, and lure her just a step or two on to the bridge. Give her some treats and praise, and then turn round and go back. Just take it a few steps at a time, over days and weeks, always praising and rewarding and turning around until she gets more confident.

My dog now 10mths old has same problem and rushes over bridges as he is obviously scared.  Have tried most things and he is better with larger bridges but we still have problems with bridges with open slats.  Sorry I have not found a solution and this has been happening since he was quite small.  Good luck

I'm sorry, i know it doesn't help, but i have the same problem, i'm terrified of going over bridges myself, so i can sympathise with her!

My youngest ahd a fear or the bridges across river in the country parks both solid and metal ones.  I just put heron lead and jolleyed her along talking in a very upbeat way and refusing to stop when she started didgging her heals in.  As she got to realise that I wasn't going to let her not cross and I was so cheerful whe soon got over it.

One of her great Uncles still collie crouches over bridges out of habit, though doesn't seem to be afraid of them anymore though was as an older pup.

I had the same trouble with my rescue Beardie.  He would not go over bridges any sort or cross a slippery floor.  We did have some joy with the ignore it an do happy things with him to get him to the other side but he was still clearly distressed and never quite got over it.  Other than this he was a very confident dog and loved water at the sea side and paddling in streams.  I think there is more movement in bridges than we are able to feel but dogs pick up on it. 

It may get less over time.  Stay up beat and keep smilling.