
How you go about getting your dogs used to them, depends on how much they don't like them
(if they really don't like them, you can't start off putting them on the dog).
If you can place the headcollar over the nose without any protest or strong dislike then you can start by just putting it on the nose (do not do it up, just hang it over the nose loosly), giving a treat then removing it.
Repeat many times, (use small training bursts, don't keep on for ages in one go). As the dog begins to feel more comfortable, then you can gradually increase the time the headcollar stays over the nose.
Then build up to fastening the headcollar before treating & removing.
Then build up to perhaps wearing the headcollar in short bursts around the house garden - maybe even prior to or during meal times for added positive association.
Be guided by your dog, don't give them a treat if they are really uncomfortable but they should not be uncomfotable atall if you work at thier pace :) Same as with all training- set them up for success:)
When I got Busters headcollar, I never even risked putting it on him right away, I kept it on the kitchen side for a couple of days and would randomly fiddle with it for him to get used to the sight of it before attempting to get him used to feeling it on him. As he has always been highly food motivated, I used meal times to get him him used to it with a few more training sessions spotted throughout the day(
the time when he's waiting for his kibble to soak before I put it down for him are the times I get the most compliance and willingness to try things from him
:) ). It was 1 week before he went for a walk with it on, but by then he completely accepted it :)
ETA just found an on-line help guide for this that words it so much better than I do -
here it is.