[yorkietalkjilly]

Keep your dog leashed to avoid his running and getting into real trouble when out in the public. I would keep desensitizing him to things in very frequent, very, very short episodes and then remove him from the sound/noise/area he fears immediately after that short exposure so that he understands even though the experience is fearful at first, it is over very quickly & he didn't get hurt. Use high-value treats(boiled chicken, turkey hot dogs - something a dog really loves and not just kibble or beef jerky or other dry treats but something juicy - when he's undergoing the episode in the park to keep his nose and food instincts as much to the forefront of his current reality as possible and the noises kind of back in his brain. Stay very positive and upbeat yourself throughout the training. Once you've left the area and he's walking along calmly, praise him genuinely.

Just keep going back to the park with him on lead and with the lovely treats to get his brain on the food when a sound happens and then quietly and matter of factly leave.

The important thing above all - you must remain very matter of fact & very, very calm through these sessions where the scary noises are. Don't pity or feel anxious about taking to him to the park - it's just the source of a fear for him but can't injure him & over time and many positive experiences, he can overcome the bad episodes with new ones tied to a high-value enticing food distraction and over time will get used to the odd sounds that happen when out and about, connecting them to good experiences. But take a deep breath and relax yourself from head to toe before you go into the park and purpose in your mind to stay relaxed even if he panics again. Each session should lesson his fear response with that good food, a calm mommie and lots of repetition to show him that noise really isn't bad.

Once he's not afraid of the noises, you can slowly reintroduce him to smelling other dog's bottoms but keep him leashed and at first, allow a sniff or two and then walk away before he associates it with the earlier panic response from the smelling and the kids noises at the same time. After you are a bit away from the dog, reward him with a nice treat and keep walking. Once he's walking calmly and you are well away from the other dog and he's not panicked, genuinely praise him. Just repeat all that for a few weeks and then slowly allow more sniffs of each dog. This over time should help him to replace the old scary times with new, good ones that don't last long. With a fearful dog, I would keep all of these episodes very short for a long, long time so he learns that nothing there where he was scared will last for too long.