I am a very active person who owns a 6 year old border collie mix, so walking/running is part of my daily routine. If I can tire her out, I'll be able to tire out your dog with a walk or run! We have been on 13 mile walks before and she still wants to play, so I feel confident that I can take on any dog. My dog is not very friendly with other dogs, so I am very familiar walking dogs that are not friendly with other dogs - that does not bother me at all. I am available after work and anytime on the weekends, and am able to take your dog on a walk longer than 30 minutes if you prefer.