We recommend a good grooming rake with tines at least 1" long to reach safely through the guard hair to pull the loose undercoat out without causing damage to the rest of the coat. A straight comb, or greyhound comb, can be a great help to separate the hair to allow for more breathability. Lastly, if you do have a double coated breed its suggestable to invest in a high velocity dryer. A HV dryer can help make quick(er) work of the fur storm, especially after a good bath!
Enjoy the warmer weather and Happy Grooming!