@REI-MichelleW Thanks so much!  I'll look into this.  It would also help for water crossings and metal bridges...  our dog does not like to get wet as she's super fluffy and sometimes her feet can fit through metal grating. Being able to carry her on our back would free up hands for better safety with poles.  We wouldn't try it with deep water crossings, but some of the more shallow crossings can be tough with the chance of slipping when carrying her in our arms.