What's next? Many dogs in Hawaii and California, where avocados fall off trees, eat avocados regularly without ill effects. Veterinarians in Hawaii accept pets' avocado-eating in moderation. They even see benefits from dog's eating avocados -- healthier coats and fewer skin problems.
Putative problem is avocado leaves, skin, and to a lesser extent flesh, contain a fatty chemical, called persin. The Merck Manual of Veterinary Medicine lists avian, rodent, and ungulate species that are susceptible to organ damage from persin in avocado leaves, stems, seed, and to a lesser extent fruit. Dogs and cats are not among the known species adversely affected by avocado fruit. The warning against dogs eating avocados rests on one case report of 2 dogs that were said to develop cardiomyopathy after injesting avocados.
Avocados are not a main food for my dogs, but they love to eat one they find on the ground in my orchard. I have seen absolutely no problems in almost 9 years from their eating the occasional avocado. Each of the 10 dogs may find one or two avocados a week. Avocados have a lot of vegetable fats, which are healthy for dogs' coats and energy levels, but too much of any good thing is undesirable. Dogs can get quite fat from eating large numbers of avocados regularly.
The warning about a dog swallowing and choking on avocado seeds applies to all small, round objects, such as golf balls, ping pong balls, parts of toys, seeds of other fruits, etc. I have not observed this phenomenon, but evidently some dogs try to ingest anything that is vaguely nutritious to supplement their inappropriate kibble diets. It is said that kibble-fed dogs will eat cat poop, and feces of other dogs. I supposes avocado seeds may be appealing to kibble-fed dogs for the same reason -- any bit of extra nutrition will be eaten.
Dogs choke on kibble and Greenies, too. My dogs don't swallow or chew on avocado seeds. They also don't eat the cat's poop or each others' poop. My dogs have raw meats to eat and meaty bones to chew.
On the same page on which the ASPCA issues dire warnings about avocados, they post the following bad advice:
Raw/Undercooked Meat, Eggs and Bones
Raw meat and raw eggs can contain bacteria such as Salmonella and E. coli that can be harmful to pets. In addition, raw eggs contain an enzyme called avidin that decreases the absorption of biotin (a B vitamin), which can lead to skin and coat problems. Feeding your pet raw bones may seem like a natural and healthy option that might occur if your pet lived in the wild. However, this can be very dangerous for a domestic pet, who might choke on bones, or sustain a grave injury should the bone splinter and become lodged in or puncture your pet’s digestive tract.There is so much misinformation in this paragraph, one hardly knows where to begin. The warning about raw eggs applies only to egg whites fed alone, not to whole eggs. How many pet owners separate egg whites from yokes to feed them to pets? The yoke of eggs contains plenty of biotin to offset avidin in egg white. Whole raw eggs are very healthy additions to pets' diets. I feed my dogs and cat raw eggs (not just the whites) with crushed egg shells (calcium carbonate) two or three times a week.
The raw meaty bones they warn against should be the principal food in dogs' and cats' diets.. Raw bones don't splinter; cooked bones splinter. Bacteria? How many times do they have to be told that dog/wolf and cat digestive system are highly acidic and short -- they are designed to handle bacterial loads that could make their human owners ill but do not adversely affect healthy pets.
Perhaps, the best warning I can issue is to remind readers the ASPCA is brought to you by Nestle-Purina, Mars, and Colgate-Palmolive. Any advice they give pet owners is filtered through their corporate sponsors. Unfortunately, the ASPCA is against feeding pets anything not produced by their corporate sponsors, including avocados, raw meats, eggs, and meaty bones. Enough said.