I think I am going to tie my dogs to a bench while I am at a park.
Why would you do that?
My dogs are huge and walking them around can be tiring.
Maybe you aren't cut out to have a dog. Feeding your pets and making sure they get enough physical exercise is part of being a dog owner. It's OK to give your dog away to someone who wants to take on the responsibility of taking care of them.
I just want to play tennis instead.
Well this could be proof that you may not have the time that you need to be a dog owner. If you just tie them to the bench once in a while this is fine, however walking them is very important so they get the exercise they need.