If Justin has 14 dogs, Rico, who has 10 more dogs than Justin, has 14+10=<<14+10=24>>24 dogs.
Since Camden just bought 3/4 times as many dogs as Rico, he bought 3/4*24=<<3/4*24=18>>18 dogs.
A dog has four legs, so Camden's 18 dogs have 18*4=<<18*4=72>>72 legs.
#### 72