Always take the dog where possible. Hate fishing in places where she isn't welcome, although I do leave her at home/in the car when there's no alternative - as I did yesterday. Whilst cleaning the fish when I got home, she was insistent on sniffing them and jumped about in glee. (Tells you it's not such a common event then!)
Am alert to the sensitivity of farmers and just drive on past a beat where sheep are close by and find an approach that is livestock-free. Nothing worse than the dog owner who announces "I would trust my dog anywhere" and thinks it's fine to march through a field of ewes. "It's okay. He's only PLAYING".
She snuffles about the bank, then settles just behind me & close if I'm static, moves down/upstream as I go. Best of all, she will let me know if anyone approaches and, especially at dusk on a tree-lined river, that means I can relax.
She also tells me to go home when she's had enough...
Trish