my girlfriend pays $15 a day to this gal who comes 1x a day for 30 minutes for a walk. i have looked into services local to us and they charge about $20 for a 30 min visit and walk per day.
we actually put portia in doggie daycare 2-3x a week to the tune of about $28 per day. but it''s all day and she gets social interaction, she can be outside in the sun or inside if she wants, there''s a resting area if they want to nap etc. then the other days she relaxes at home and just chills out. so it works out pretty well.