Hello! Started the exciting business of shopping for our puppy! I'm thinking I will need some kind of sling/carrier for her until she can go on the ground (I have three kids, so I don't think carrying the puppy everywhere in my arms is an option - will need hands free some of the time!). Any recommendations? I was looking at slings, but I wonder if that's OK for their little joints? But the front carriers look so uncomfortable. Any thoughts? Thank you.