We have two dogs (one being a new puppy), two cats, and one fish. The cats we leave at home and my parents drop by to clean the litter box and refill their food/water. The dogs go to my parents house, which the dogs LOVE it there. The fish is fed when my parents drop by to tend to the cats.
Now....when my parents go on a trip with us, this causes a whole lot of trouble LOL. We just got back from a weekend trip to Disney where my parents, sisters, and both sets of grandparents went with us. The fish we overfed right before we left and he was fine till we got back. The cats we set out several extra bowls of food and water and let them have the run of the house. The litter box was a little full upon returning home, but our cats dont seem to care.
The puppy, we took to our cousin's house. She has three little girls and they just loved our little puppy. He did great there.
And our Jack Russell, we took with us to Disney and boarded him there.
Now, when we go camping, we just take the two dogs with us.