Quite right too Ian, and that would be the case with any animals including ourselves as alot of injuries are undetectable with the human eye, and not being a qualified professional in the medical field, I wasn't really making a diagnosis more giving John an idea of visible possibilities that could be seen wrong with the bird. That's why I chose my words (normally and usually visible) carefully, and because it was this particular species I thought it worth mentioning the Trichomoniasis even though I did say I wasn't sure if it had bearing on this bird!
Cheers, Rob.

Did you get my PM?

Hi John,
What I'm about to tell you may or may not have any bearing on your predicament with this bird as it might depend on area.
Last week at a site near us on the Denton-Stockport border, my brother saw a number of dead Collared Doves due to a disease a site poster said. Yesterday I found out off another birder on here that at the same place in the last couple of weeks, there was an outbreak of Trichomoniasis that led to deaths and subsequently feeding stations, bird tables etc on the site being disinfected.

It's only a thought but if this bird has contracted the disease and it hasn't yet entered the final stage, it could well render the bird helpless to even try to get away from you, only a thought but I would wear gloves before bringing in the house etc.

If it is injured, it will be limping or falling over, if its a wing injury that too is usually obvious, as it will have feathers well out of place or broken, or it will be trailing at the side of the body as it can't lift it due to a broken bone.
The other injuries eg.attack injury, would also be normally easy to see ie. blood, puncture wound etc, UNLESS it has flown into a window, or has been roughed up in an attack and has just been dazed.

These are only initial thoughts so I would wait for any 2nd opinions if you get any other replies.
Cheers
Rob

It looks full size, but for now I'll leave it alone unless I get any stronger advice. If it doesn't fly away I fear the local fox or a cat will see it off in the night. That's life.

Well, I don't think I have the sufficient knowledge to tell you about what to do, but I can suggest to you firstly that the dove could be a juvenile bird who has just fledged, and may be not injured at all. Its parents could be nearby. If this is the case then it is best to leave the bird where it is. However, if it really is in trouble, maybe you should probably send it to a the RSPCA? Probably somebody else could give some more specific advice on what to do.