Hard to get rid of the bubbles? Don't inject air pockets!
I gave shots to Onyx for almost a year and didn't notice any difference, I don't think two days is going to desensitize a dog to allergies. It all depends on WHAT the dog is allergic to. I think food allergies are much easier to manage than environmental.
Onyx became very defensive when the jab time came around, peanut butter, canned spray cheese helped, but not much to distract her. She became very wary of me and it was sad.