Every time there is tailbiting in MLP: FiM

Season 1

1. Applejack bites Rainbow Dash's tail (Friendship is Magic Part 1)
2. Applejack bites Rainbow Dash's tail (Friendship is Magic Part 2)
3. Fluttershy bites Rarity's tail (Friendship is Magic Part 2)
4. Rainbow Dash bites Twilight Sparkle's tail (Friendship is Magic Part 2)
5. Applejack bites Rainbow Dash's tail (The Ticket Master)
6. Applejack bites Rainbow Dash's tail (Dragonshy)
7. Berry Punch bites Berry Pinch's tail (Bridle Gossip)
8. Applejack bites Twilight Sparkle's tail (Swarm of the Century)
9. Spike bites Applejack's tail (Fall Weather Friends)
10. Applejack bites Rainbow Dash's tail (Fall Weather Friends)
11. Rainbow Dash bites Applejack's tail (Fall Weather Friends)
12. Gummy bites Pinkie Pie's tail (Feeling Pinkie Keen)
13. Twilight Sparkle bites Pinkie Pie's tail (Feeling Pinkie Keen)
14. Twilight Sparkle bites Spike's tail (Feeling Pinkie Keen)
15. Applejack bites Pinkie Pie's tail (Feeling Pinkie Keen)
16. Applejack bites Spike's tail (A Dog and Pony Show)
17. Twilight Sparkle bites Applejack's tail (A Dog and Pony Show)
18. Rainbow Dash bites Twilight Sparkle's tail (A Dog and Pony Show)
19. Fluttershy bites Rainbow Dash's tail (A Dog and Pony Show)
20. Pinkie Pie bites Fluttershy's tail (A Dog and Pony Show)
21. Twilight Sparkle bites Spike's tail (Green Isn’t Your Color)
22. Rainbow Dash bites Pinkie Pie's tail (Over A Barrel)
23. Mrs. Cake bites Pinkie Pie's tail (A Bird in the Hoof)
24. Twilight Sparkle bites Philomena's tail (A Bird in the Hoof)
25. Gummy bites Spike's tail (Party of One)
26. Rainbow Dash bites Pinkie Pie's tail (Party of One)

Season 2

1. Big Macintosh bites BonBon's tail (Lesson Zero)
2. Pipsqueak bites Princess Luna's tail (Luna Eclipsed)
3. Gummy bites Pinkie Pie's tail (May the Best Pet Win)
4. Eel bites Falcon's tail (May the Best Pet Win)
5. Gummy bites Pinkie Pie's tail (May the Best Pet Win)
6. Gummy bites Pinkie Pie's tail again (May the Best Pet Win)
7. Sweetie Belle bites Scootaloo's tail (Secret of My Excess)
8. Applejack bites Pinkie Pie's tail (Secret of My Excess)
9. Scootaloo bites Apple Bloom's tail (Family Appreciation Day)
10. Sweetie Belle bites Scootaloo's tail (Family Appreciation Day)
11. Pinkie Pie bites Pound Cake's tail (Baby Cakes)
12. Big Macintosh bites Apple Bloom's tail (The Super Speedy Cider Squeezy 6000)
13. Applejack bites Rainbow Dash's tail (The Super Speedy Cider Squeezy 6000)
14. Apple Bloom bites Big Macintosh's tail (Hearts and Hooves Day)
15. Rarity bites Fluttershy's tail (Putting Your Hoof Down)
16. Goat bites Pinkie Pie's tail (Putting Your Hoof Down)
17. Rainbow Dash bites Fluttershy's tail (Dragon Quest)

Season 3

1. Applejack bites Rainbow Dash's tail (The Crystal Empire Part 2)
2. Bird 1 bites Fluttershy's tail (Magic Duel)
3. Bird 2 bites Fluttershy's tail (Magic Duel)
4. Cow bites Scootaloo's tail (Sleepless in Ponyville)
5. Winona bites Donut Joe's tail (Just for Sidekicks)

Season 4

1. Gummy bites Pinkie Pie's tail (Castle Mane-ia)
2. Withers bites Daring Do's tail (Daring Don’t)
3. Applejack bites Rainbow Dash's tail (Power Ponies)
4. Pinkie Pie bites Rainbow Dash's tail (Maud Pie)
5. Gummy bites Maud Pie's tail (Maud Pie)
6. Pinkie Pie bites Rainbow Dash's tail (Testing Testing 1 2 3)

Season 5

1. Unnamed Hooffield stallion bites Unnamed McColt stallion's tail (The Hooffields and McColts)

Season 6

1. Lockdown bites Pinkie Pie's tail (The Saddle Row Review)
2. Rainbow Dash bites Quibble Pants's tail (Stranger Than Fan Fiction)
3. Thorax bites Spike's tail (The Times They Are A Changeling)
4. Applejack bites Big Macintosh's tail (Where the Apple Lies)
5. Queen Chrysalis bites Starlight Glimmer's tail (To Where and Back Again Part 2)

Season 7

1. Rainbow Dash bites Windy Whistles's tail (Parental Glideance)
2. Gummy bites Pinkie Pie's tail (Not Asking for Trouble)
3. Gummy bites Pinkie Pie's tail again (Not Asking for Trouble)
4. Maulwurf bites Pharynx's tail (To Change A Changeling)
5. Applejack bites Rainbow Dash's tail (Shadow Play Part 1)
6. Pinkie Pie bites Fluttershy's tail (Shadow Play Part 1)

My Little Pony: The Movie

1. Tempest bites Fish Monster's tail
2. Rarity bites Spike's tail

Season 8

1. Maud Pie bites Pinkie Pie's tail (The Maud Couple)
2. Granny Smith bites Rainbow Dash's tail (Grannies Gone Wild)
3. Scootaloo bites Sweetie Belle's tail (School Raze Part 2)
4. Apple Bloom bites Scootaloo's tail (School Raze Part 2)
5. Sandbar bites Apple Bloom's tail (School Raze Part 2)

Season 9

1. Applejack bites Pinkie Pie's tail (The Summer Sun Setback)

Total: 75