| Abbreviation | Definition |
|---|---|
| IBDA | International Bird Dog Association |
| ICSB | International Canine Semen Bank |
| IDAPI | Inmate Dog Alliance Project of Idaho |
| IDBR | Indonesian Dog Breeders Registry |
| IDCR | International Designer Canine Registry |
| IESDA | Inland Empire Sled Dog Association |
| ILA | International Labradoodle Association |
| ILMD | I Love My Dog |
| ILP | Indefinite Listing Privilege |
| IMDT | Institute of Modern Dog Trainers |
| INB | Introduced New Breed |
| IOEBA | International Olde English Bulldogge Association |
| IPOC | Imperial Polk Obedience Club |
| IPWD | In Partnership With Dogs |
| IRCD | It's raining cats and dogs |
| ISBC | Irish Setter Breeders Club |
| ISDI | Inuit Sled Dog International |
| ISDS | International Sheep Dog Society |
| ISS | "I STOPPED SHOWERING!" 'inergee saving agenda' |
| IWCA | Irish Wolfhound Club of America, Inc. |