Hi, Lola would overheat and I went to extremes to be sure I had items on hand that would help her. This means that I have gone overboard, however I do have one really nice cooling vest that we take with us on road trips especially int he summer when there is the rare chance our car would die and the A/C would be done for. Its used for military and police dogs, the RPCM chillydog cooling vest. We keep the cooling packs in the cooler for the ride, and if we need them, they come out into the vest. Otherwise the keep the food cold. In ice water, the packs will refreeze within minutes. Worth the cost in my opinion. Consider getting the small size though.