My wife and I hike with our 90 pound Shepherd. We use a Tarptent Rainshadow II and it works great for 2 people and a large dog. The foot end of the tent is mostly screen and our dog loves to lay side to side there to look out and get fresh air. Even with her sprawled across the foot end of the tent there's plenty of room for us and a lot of our gear. We've been using it for years, our dog's nails have never cut the floor.
Only you can decide if it's light enough or cheap enough for your needs.