As one might guess given my involvement with rescue, I am a firm advocate of spaying and neutering pet companion animals - not only for population control, but also for health reasons*. That said, I have some experience with chemical castration, which is reversible.
Melon (one of the few lucky dogs to make it out of a Spanish killing station alive - see the population control comment) was put on Tardak when he came into rescue, because his grossly enlarged prostate and general poor health made surgery too risky for him at the time.
All the males in this rescue (and most rescues) are neutered or chemically castrated, as the dogs exercise in an open group. In such large groups of possibly untrained dogs where the pack is always changing and supervision is limited, uncastrated males tended to cause social problems - and of course there was always the danger of unwanted pregnancies. This is also why some kennels and doggie day care facilities here require males to be neutered.
Back to chemical castration:
If you go for this option, please research the various drugs available, especially look at the side effects.
Tardak works by adding the female hormone progesterone. Surgical castration obviously reduces testosterone, so while infertility is the end result in each case the chemical changes are very different, and one is not really a replacement of the other.
A reported - but somewhat uncommon - side effect of Tardak use is increased aggression or increased fear behaviors in some dogs. I took Melon off the Tardak immediately when I adopted him and had him neutered (as by this time due to his enlarged prostrate he was urinating blood and couldn't stand for the pain) so I can't speak to any personal experience with long-term Tardak behavioral effects. Certainly the Tardak didn't help his enlarged prostate. A colleague's dog became severely aggressive on Tardak.
Most vets here have switched to newer drugs, but some still use Tardak. If you opt for chemical castration, do make sure you understand which drug the vet recommends, and why - and again, do your research before giving the go ahead.
The newer implant, Supralorin, suppresses testosterone, more closely mimicking surgical castration. I only know of one person who has used it - the owner had not had any problems so far, reports no behavior changes.
http://www.noahcompendium.co.uk/Virb...gs/-48969.html
Do make sure you speak with the vet as to how long a dog should be on chemical castration drugs.
Some info on chemical castration:
From the European Veterinary Society For Small Animal reproduction:
http://www.ivis.org/proceedings/iscfr/2012/36.pdf?LA=1
From the University of Utrecht, a study of chemical castration and behavior:
http://igitur-archive.library.uu.nl/...7/UUindex.html
http://igitur-archive.library.uu.nl/...ief%5B1%5D.pdf
There is also another drug, Neutrasol, but I don't know if it is available here. Some info - do especially read about administration issues (it's injected directly into the testicles) and side effects:
http://www.petplace.com/dogs/chemica...sol/page1.aspx
http://www.vetinfo.com/chemical-cast...or-dogs.html#b
Be aware that the effects of any chemical castration on fertility - just like surgical castration - are not immediate. Generally 6 weeks is the 'safety period'.
As to whether a doggie daycare center would accept chemical castration as an alternative to surgical... you really need to speak to the management at each facility. I would imagine proof of on-going treatment would be needed, at a minimum.
Hope you find a dog care solution. Have you considered hiring a sitter to care for your dog at home?
* Health issues of remaining entire: I've had two dogs with severe prostate enlargement, two with testicular cancer. One died far too young, one easily survived the testicular cancer, but it led to hyperestrogenism. He later developed other cancers; we now wonder whether the estrogens released might have played a part in his later cancers. But that is pure speculation. All these dogs could have been spared the pain and related illnesses had they been surgically castrated at earlier ages. Prostate problems and testicular cancers generally surface in older dogs.
That said, any elective surgery should be considered very carefully if the dog is at increased anesthesia risk - and since your guy is a brachycephalic breed there might be anesthesia concerns. Speak to your vet about this. (If unneutered for health concerns, this decision should be reviewed regularly.) Also, some dogs with fear-related behavior problems might not be candidates for neutering until such time as the behaviors have been addressed. Always speak with a qualified behaviorist in such cases.
The important thing, though, is that you make all decisions with your own dog's best interest at heart.