I've read that it is recommended to give Omega-3 to elderly dogs (especially ones with arthritis) (for example, [here][1]).

My dog is a 15 years old female medium sized, mixed breed (probably mostly German Shepard), weighing approximately 25 kg (55 lbs).

My questions are:

1. What amount of Omega-3 should I give her?
2. Does the source of the Omega-3 matter (e.g. fish oil)?

[1]: What will help an aging dog with arthritis?)

I've read that it is recommended to give Omega-3 to elderly dogs (especially ones with arthritis) (for example, [here][1]).

My dog is a 15 years old female medium sized, mixed breed (probably mostly German Shepherd), weighing approximately 25 kg (55 lbs).

My questions are:

1. What amount of Omega-3 should I give her?
2. Does the source of the Omega-3 matter (e.g. fish oil)?

[1]: What will help an aging dog with arthritis?)