Here is a list of some of his most notable projects:
Television:
* The Adventures of Rin Tin Tin (1954-1959) - Rusty
* The Lone Ranger (1955) - Rusty
* The Cisco Kid (1954-1956) - Rusty
* The Adventures of Champion (1955-1956) - Rusty
* The Red Skelton Hour (1951-1971) - Various Roles
* The Roy Rogers Show (1951-1957) - Rusty
* The Gene Autry Show (1950-1956) - Rusty
* The Range Rider (1951-1953) - Rusty
* The Mickey Mouse Club (1955-1959) - Guest Star
* Disneyland (1954-1959) - Guest Star
* The Adventures of Superman (1952-1958) - Guest Star
* The Gale Storm Show (1955-1956) - Rusty
* Lassie (1954-1973) - Rusty
* Wagon Train (1957-1965) - Rusty
* Gunsmoke (1955-1975) - Rusty
* The Twilight Zone (1959-1964) - Rusty
* Bonanza (1959-1973) - Rusty
* The Rifleman (1958-1963) - Rusty
* The Virginian (1962-1971) - Rusty
* The Big Valley (1965-1969) - Rusty
* The Wild Wild West (1965-1969) - Rusty
Film:
* The Red Stallion in the Rockies (1949) - Rusty
* The Sun Valley Kid (1949) - Rusty
* Canadian Pacific (1949) - Rusty
* The Adventures of Rin Tin Tin (1954) - Rusty
* Rin Tin Tin: The Phantom Empire (1955) - Rusty
* The Great Locomotive Chase (1956) - Rusty
* The Littlest Outlaw (1957) - Rusty
* The Adventures of Rin Tin Tin (1960) - Rusty
This is not an exhaustive list, but it highlights some of Lee Aaker's most notable work. He appeared in numerous other television series and films throughout his career.
It's important to note that, while "Rusty" was a recurring character in many of these programs, Lee Aaker did not always play him.