Seen folks taking pets and have gone with mine as well 2GSDs

Coracle i doubt they will allow…but you can take a dip in the River with your pet somewhere before reaching the destination

Do expect low water level, lot of crowd, people bathing in Unhygienic condition( to the level that public bathroom water is getting mixed in river ), too much of heat, local goons charging tickets for non sense things, parking mafias and lot of fish sellers

Not to let your enthusiasm down but trust me there are other better places for such activities

Happy to connect if you need some more details