Probably would be best to feed after a walk? Just to be on the safe side...
My girls are both grazers anyway, so they never consume large amounts of food and then go on walks because they just nibble throughout the day, it was the only way to get Izzie to eat her food as a puppy.
A man I once met on a dog walk told me that he used to have a standard poodle who died from bloat :/ He said it happened on a walk and that they tried to correct it with surgery and it just happened again (basically what happened on marley and me, they can just twist straight back after correction).
It is said to happen in breeds with deep chests, but poodles do have deep chests so obviously everyone should be aware of that, my Izzie is only a small dog about 14" to her shoulders, but her chest is quite deep.
I'm sure everything will be fine though

Don't worry too much, it's just good to be weary of x