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I would keep them potted for another season and then transplant. These articles should help for future reference: https://www.gardeningknowhow.com/ornamental/vines/wisteria/transplant-wisteria-vines.htm
https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

Wisteria grow rapidly. While it could stay in that pot for a year or so, after that you would have a hard time providing enough water for the plant in that pot.

Wisteria normally do not make good container plants because they grow too big and too fast. But that being said, if you're using a big tub, the vine may make it. It won't stay small though.

You need to provide the location where you live before this question can be answered properly. Thanks.

Wisterias are pretty tough, so I doubt it's the dog. Your plants may be pot bound or the soil may be depleted of nutrients. While wisterias don't need much fertilizer, they do need some nutrients to survive. You also may want to read the following article: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-diseases.htm

In that kind of heat, in a pot, the plant may not be able to take up enough water so that it can take up the iron it needs. Increase water to the plant and that should help. Plants can only take their nutrients up in combination with water. Not enough water will mean not enough nutrients. Plants in pots need much more water than plants in the ground as the water can evaporate quickly, especially in high heat.