VictoriaEdmondson

I have a problem with an 8 yr old cocker spaniel who belonged to a friend who recently passed away. her biggest issue is with my cat (who is fine with dogs and actually wants to be her friend). but Sasha seems to be a little scared of cats and is mega overpossessive of her food and toys /stolen trophies and acts quite aggressive towards the cat chasing and barking. she even growls or barks when when I call the cat and if he comes into thd room she will immediately search for something to guard. i need to give her some training to stop this behaviour as it drives me mad before I work on other stuff like listening to me etc. can anyone let me know what training I can give her/where to find it please?