Any suggestions for a temporary pond?

My mom is moving soon and unfortunately the house they are in the process of buying, won’t be available for about a month after they have to be out of their current home they just sold.
One of the many problems caused by this clusterfuck of a move, is that my mom has a pond in the backyard of the house they just sold, and the fish need to eventually get to the new house once it’s available, but until then, they need a temporary location. My stepdads brother and his wife have offered to let her build a temp pond at their house and this may be her only location option really, unfortunately they have A LOT of dogs so the temp pond needs to be somewhat dog-proof.
We have considered a lot of different options, but I thought fluther might have a creative alternative to suggest….

Here is the pond at the moment. There are about 30–50 fish and some are over 15 years old. The goal is for all of the fish to survive this move, (we lost a couple the last time we moved them.)