Hi spacebear3 -
I am so sorry to hear about your dog - we have lots of dog lovers on this site (I have a wonderful Border Terrier called Stanley) and we know how traumatic it is when they are sick - they are our best friend and part of the family - I do hope he/she recovers soon.
If you are under the guidance of a highly regarded specialist then I suspect the hormones you are being given will be properly prepared and safe to use - you are also being monitored closely which is essential.
There is a good deal of scepticism here in the UK regarding the safety of some of the compounded hormones that are used around the world; the term compounded BHRTS usually refers to hormones produced by independent chemists and not properly processed in a laboratory, therefore these HRTs have not been rigorously tested to ascertain whether they are safe to use - so essentially one cannot be certain what is in them. I am sure your doctors source your HRT from a reputable laboratory.
In the UK we have a health body, called NICE, that ensures that all treatments offered in the NHS have had proper and rigorous testing so benefits, side effects and risks are fully known and can therefore be prescribed by our medical profession accordingly.
The Conventional Oestrogen we get here in the UK is mostly now bio identical and we also have Utrogestan (known as Prometrium in the USA) which is a bio identical progesterone - you may read on this site that many of us are already using BHRT - usually oestrogen, as either patch or gel, together with Utrogestan and this can be used as either sequential or continuous hormone treatment depending on where you are in your menopause. The BHRT we are prescribed has gone through many tests and trials and is produced in a lab to ensure the quality so it can be allowed on license. I'm sure your doctor will be familiar with these BHRTs. I suspect you will be needing a higher dose to reduce your symptoms.
I do hope you feel better soon. Dg x