Custom Horse Breathing Mask

I need a specialized breathing mask for a horse suffering from Heaves (Recurrent Airway Obstruction). The mask's primary function is to aid in respiratory treatment.

Requirements:
- The mask should effectively aid in the treatment of Heaves.
- It needs to be comfortable and secure for the horse.
- Durable materials are required to withstand outdoor conditions

Ideal Skills and Experience:
- Experience in designing animal respiratory aids
- Knowledge of equine respiratory conditions
- Skilled in using durable, comfortable materials

Please provide examples of similar work done.